JP5424391B2 - Magnesium alloy rolled material and method for producing the same - Google Patents
Magnesium alloy rolled material and method for producing the same Download PDFInfo
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本発明は、マグネシウム合金圧延材並びにその製造方法に関するものである。 The present invention relates to a rolled magnesium alloy material and a method for producing the same.
マグネシウムはアルミニウムよりも比重が小さく（構造用金属材料の中では最も軽く）軽量化が容易で、また比剛性が高く、更に天然資源が豊富でリサイクル性にも富むなどの利点を有することから、このマグネシウムを主成分とした種々のマグネシウム合金が提案されている。 Magnesium has advantages such as smaller specific gravity than aluminum (the lightest among structural metal materials), easy weight reduction, high specific rigidity, rich natural resources, and high recyclability. Various magnesium alloys based on this magnesium have been proposed.
ところで、近年のマグネシウム合金の普及及び用途拡大に伴い、更なる機械的性質の向上が要望されている。 By the way, with the recent spread of magnesium alloys and expansion of applications, further improvement in mechanical properties is demanded.
そこで、例えば特許文献１，２に開示されるように、アルミニウム，カルシウム及びマンガンを含有するマグネシウム合金材が提案されており、この特許文献１，２においては、アルミニウム及びマンガンを含有させることで強度を向上させ、アルミニウムの増加に伴う難燃性（耐熱性）の低下をカルシウムにより抑制することで、希土類元素を含まずに耐熱性に優れたマグネシウム合金材を安価に製造できるとされている。 Thus, for example, as disclosed in Patent Documents 1 and 2, magnesium alloy materials containing aluminum, calcium, and manganese have been proposed. In Patent Documents 1 and 2, strength is achieved by containing aluminum and manganese. It is said that a magnesium alloy material that does not contain a rare earth element and has excellent heat resistance can be manufactured at a low cost by suppressing the decrease in flame retardance (heat resistance) accompanying the increase in aluminum.
本発明は、マグネシウム合金材の更なる機械的性質の向上を図るべく、種々の実験を行った結果、アルミニウム、カルシウム及びマンガンを夫々所定量含有させると共に、アルミニウム及びカルシウムを略同量含有させたマグネシウム合金に所定の圧延加工を行うことで、極めて機械的性質に優れるマグネシウム合金圧延材を製造可能となることを見出し完成したもので、極めて優れた機械的性質を発揮可能で且つ低コストで製造可能な極めて実用性に優れるマグネシウム合金圧延材並びにその製造方法を提供することを目的としている。 In the present invention, various experiments were conducted to further improve the mechanical properties of the magnesium alloy material. As a result, a predetermined amount of aluminum, calcium, and manganese was contained, and substantially the same amount of aluminum and calcium was contained. It has been found that a magnesium alloy rolled material with extremely excellent mechanical properties can be produced by performing a predetermined rolling process on the magnesium alloy, and it can be produced at a low cost and can exhibit extremely excellent mechanical properties. An object of the present invention is to provide a magnesium alloy rolled material that can be extremely practically used and a method for producing the same.
添付図面を参照して本発明の要旨を説明する。 The gist of the present invention will be described with reference to the accompanying drawings.
０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金を、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工し、続いて、前記粗圧延加工より低い圧下率で且つ前記粗圧延加工より低い温度で仕上圧延加工して成ることを特徴とするマグネシウム合金圧延材に係るものである。 0.5-3.5 mass% aluminum (Al), 0.5-3.5 mass% calcium (Ca), and 0.30 mass% or less manganese (Mn) are contained, with the balance being A magnesium alloy composed of magnesium (Mg) and unavoidable impurities and containing the aluminum (Al) and the calcium (Ca) in a ratio of 0.90 to 1.10: 1.10 to 0.90, Rough rolling in the range of 40 to 60% and in the temperature range of 300 to 400 ° C., followed by finish rolling at a lower rolling reduction than the rough rolling and at a temperature lower than the rough rolling. The present invention relates to a rolled magnesium alloy material.
また、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金を、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工し、続いて、圧下率が１５〜３５％の範囲で且つ２００〜３００℃の温度範囲で仕上圧延加工して成ることを特徴とするマグネシウム合金圧延材に係るものである。 Moreover, 0.5-3.5 mass% aluminum (Al), 0.5-3.5 mass% calcium (Ca), and 0.30 mass% or less manganese (Mn) are contained, A magnesium alloy containing the balance of magnesium (Mg) and inevitable impurities and containing the aluminum (Al) and the calcium (Ca) in a ratio of 0.90 to 1.10: 1.10 to 0.90, Rough rolling is performed at a rate of 40 to 60% and a temperature range of 300 to 400 ° C., and then finish rolling is performed at a rolling reduction of 15 to 35% and a temperature range of 200 to 300 ° C. The present invention relates to a rolled magnesium alloy material.
また、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金を、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工し、続いて、圧下率が１５〜３５％の範囲で且つ２００〜３００℃の温度範囲で仕上圧延加工して成り、引張強さが２００ＭＰａ以上、０．２％耐力が１５０ＭＰａ以上且つ伸びが１５％以上であることを特徴とするマグネシウム合金圧延材に係るものである。 Moreover, 0.5-3.5 mass% aluminum (Al), 0.5-3.5 mass% calcium (Ca), and 0.30 mass% or less manganese (Mn) are contained, A magnesium alloy containing the balance of magnesium (Mg) and inevitable impurities and containing the aluminum (Al) and the calcium (Ca) in a ratio of 0.90 to 1.10: 1.10 to 0.90, Rough rolling is performed at a rate of 40 to 60% and a temperature range of 300 to 400 ° C., and then finish rolling is performed at a rolling reduction of 15 to 35% and a temperature range of 200 to 300 ° C. The present invention relates to a magnesium alloy rolled material characterized by having a tensile strength of 200 MPa or more, a 0.2% proof stress of 150 MPa or more, and an elongation of 15% or more.
また、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金に、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工を行い、続いて、前記粗圧延加工より低い圧下率で且つ前記粗圧延加工より低い温度で仕上圧延加工を行うことを特徴とするマグネシウム合金圧延材の製造方法に係るものである。 Moreover, 0.5-3.5 mass% aluminum (Al), 0.5-3.5 mass% calcium (Ca), and 0.30 mass% or less manganese (Mn) are contained, The balance is made of magnesium (Mg) and inevitable impurities, and the aluminum (Al) and the calcium (Ca) are contained at a ratio of 0.90 to 1.10: 1.10 to 0.90. A rough rolling process is performed in a temperature range of 40 to 60% and a temperature range of 300 to 400 ° C., and then a finish rolling process is performed at a lower reduction rate than the rough rolling process and at a temperature lower than the rough rolling process. The present invention relates to a method for producing a rolled magnesium alloy material.
また、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金に、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工を行い、続いて、圧下率が１５〜３５％の範囲で且つ２００〜３００℃の温度範囲で仕上圧延加工を行うことを特徴とするマグネシウム合金圧延材の製造方法に係るものである。 Moreover, 0.5-3.5 mass% aluminum (Al), 0.5-3.5 mass% calcium (Ca), and 0.30 mass% or less manganese (Mn) are contained, The balance is made of magnesium (Mg) and inevitable impurities, and the aluminum (Al) and the calcium (Ca) are contained at a ratio of 0.90 to 1.10: 1.10 to 0.90. A rough rolling process is performed in a temperature range of 40 to 60% and a temperature range of 300 to 400 ° C., and then finish rolling is performed in a temperature range of 15 to 35% and a temperature range of 200 to 300 ° C. The present invention relates to a method for producing a rolled magnesium alloy material.
また、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金に、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工を行い、続いて圧下率が１５〜３５％の範囲で且つ２００〜３００℃の温度範囲で仕上圧延加工を行うことで、引張強さが２００ＭＰａ以上、０．２％耐力が１５０ＭＰａ以上且つ伸びが１５％以上のマグネシウム合金圧延材を製造することを特徴とするマグネシウム合金圧延材の製造方法に係るものである。 Moreover, 0.5-3.5 mass% aluminum (Al), 0.5-3.5 mass% calcium (Ca), and 0.30 mass% or less manganese (Mn) are contained, The balance is made of magnesium (Mg) and inevitable impurities, and the aluminum (Al) and the calcium (Ca) are contained at a ratio of 0.90 to 1.10: 1.10 to 0.90. A rough rolling process is performed in a temperature range of 40 to 60% and a temperature range of 300 to 400 ° C., and then a finish rolling process is performed in a temperature range of 15 to 35% and a temperature range of 200 to 300 ° C. Thus, a magnesium alloy rolled material having a tensile strength of 200 MPa or more, a 0.2% proof stress of 150 MPa or more, and an elongation of 15% or more is provided. .
本発明は上述のように構成したから、極めて優れた機械的性質を発揮可能で且つ低コストで製造可能な極めて実用性に優れるマグネシウム合金圧延材並びにその製造方法となる。 Since the present invention is configured as described above, it becomes a magnesium alloy rolled material that can exhibit extremely excellent mechanical properties and can be manufactured at a low cost and is extremely practical, and a method for manufacturing the same.
好適と考える本発明の実施形態を、図面に基づいて本発明の作用を示して簡単に説明する。 An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.
本発明に係るマグネシウム合金圧延材は、０．５〜３．５質量％のアルミニウムと、０．５〜３．５質量％のカルシウムと、０．３０質量％以下のマンガンとを含有し、残部がマグネシウム及び不可避不純物から成り、前記アルミニウムと前記カルシウムとを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金を圧延加工して成形する。 The magnesium alloy rolled material according to the present invention contains 0.5 to 3.5% by mass of aluminum, 0.5 to 3.5% by mass of calcium, and 0.30% by mass or less of manganese, and the balance. Is formed by rolling a magnesium alloy containing magnesium and inevitable impurities and containing the aluminum and calcium in a ratio of 0.90 to 1.10: 1.10 to 0.90.
具体的には、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工し、続いて、前記粗圧延加工より低い圧下率で且つ前記粗圧延加工より低い温度で仕上圧延加工することで、特許文献１の表１に開示される引張強さ（１０４．８〜１５８．０ＭＰａ）及び伸び（１．７５〜２．５３％）を大幅に超える、引張強さが２００ＭＰａ以上、０．２％耐力が１５０ＭＰａ以上且つ伸びが１５％以上のマグネシウム合金圧延材を得ることができる。 Specifically, rough rolling is performed at a rolling reduction in the range of 40 to 60% and in a temperature range of 300 to 400 ° C., and then at a lower rolling reduction than the rough rolling and at a temperature lower than the rough rolling. By performing finish rolling, the tensile strength (104.8 to 158.0 MPa) and the elongation (1.75 to 2.53%) disclosed in Table 1 of Patent Document 1 are greatly exceeded. A magnesium alloy rolled material having 200 MPa or more, 0.2% proof stress of 150 MPa or more, and elongation of 15% or more can be obtained.
これは、（１）０．５〜３．５質量％のアルミニウムが含有されることで、引張変形中の双晶の発生が抑制され強度が向上し、また、動的再結晶による結晶粒微細化に伴い延性が向上し、（２）アルミニウムと略同量のカルシウムが含有されることでも上記双晶の発生が抑制され、且つ、粒界及び粒内にＣ１５（Ａｌ２Ｃａ）型化合物が生成し、このＣ１５型化合物が上記動的再結晶を促進し、大量に生成した微細結晶粒が強い集合組織を形成し、（３）上記量のアルミニウム及びカルシウムに加え、更に０．３０質量％以下のマンガンが含有されることで、微細なＡｌ−Ｍｎ系析出物が析出し、この析出物により上記双晶の発生が抑制され、Ｃ１５型化合物が再結晶粒をピン止めすることで上記動的再結晶による再結晶粒が微細化し、更に強い集合組織も形成され、（４）当該集合組織が形成されることで、引張特性が顕著に向上したためと考えられる。 This is because (1) 0.5 to 3.5% by mass of aluminum is contained, the generation of twins during tensile deformation is suppressed, the strength is improved, and the crystal grain fineness by dynamic recrystallization is improved. (2) The generation of twins is suppressed even when calcium is contained in the same amount as aluminum, and a C15 (Al 2 Ca) type compound is present in the grain boundaries and grains. This C15 type compound promotes the dynamic recrystallization, and a large amount of fine crystal grains form a strong texture. (3) In addition to the above amount of aluminum and calcium, 0.30% by mass By containing the following manganese, fine Al—Mn-based precipitates are precipitated, the generation of the twins is suppressed by the precipitates, and the C15 type compound pins the recrystallized grains to The recrystallized grains are refined by Strong texture also formed, (4) By the texture is formed, the tensile properties is believed to be due to markedly improved.
本発明の具体的な実施例について図面に基づいて説明する。 Specific embodiments of the present invention will be described with reference to the drawings.
本実施例は、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金に、圧下率が４０〜６０％の範囲で且つ３００〜４００℃の温度範囲で粗圧延加工を行い、続いて圧下率が１５〜３５％の範囲で且つ２００〜３００℃の温度範囲で仕上圧延加工を行うことで、引張強さが２００ＭＰａ以上、０．２％耐力が１５０ＭＰａ以上且つ伸びが１５％以上のマグネシウム合金圧延材を製造するものである。 In this example, 0.5 to 3.5% by mass of aluminum (Al), 0.5 to 3.5% by mass of calcium (Ca), and 0.30% by mass or less of manganese (Mn). A magnesium alloy containing the balance of magnesium (Mg) and inevitable impurities and containing the aluminum (Al) and the calcium (Ca) in a ratio of 0.90 to 1.10: 1.10 to 0.90. Further, rough rolling is performed in a temperature range of 40 to 60% and a temperature range of 300 to 400 ° C, and then finish rolling is performed in a temperature range of 15 to 35% and a temperature range of 200 to 300 ° C. By performing the processing, a rolled magnesium alloy material having a tensile strength of 200 MPa or more, a 0.2% proof stress of 150 MPa or more, and an elongation of 15% or more is produced.
本実施例においては、０．５０質量％のアルミニウムと、０．５０質量％のカルシウムと、０．３０質量％のマンガンとを含有し、残部がマグネシウム及び不可避不純物から成るマグネシウム合金を用いた（アルミニウムとカルシウムとが約１：１の割合で含有）。 In this example, a magnesium alloy containing 0.50% by mass of aluminum, 0.50% by mass of calcium, and 0.30% by mass of manganese with the balance being magnesium and inevitable impurities was used ( (Aluminum and calcium are contained at a ratio of about 1: 1).
尚、各元素の含有量は、アルミニウム及びカルシウムは０．５〜１．０質量％の範囲で、マンガンは０．３０質量％以下の範囲で夫々適宜設定するのが好ましい。アルミニウムの含有量が上記数値を超える、あるいはカルシウムの含有量が上記数値より少ないと、不可避不純物であるＣ３６（（Ｍｇ，Ａｌ）２Ｃａ）型化合物及びＣ１５（Ａｌ２Ｃａ）型化合物が晶出し易くなり脆化し易くなるという問題が生じ、カルシウムの含有量が上記数値を超える、あるいはアルミニウムの含有量が上記数値より少ないと、不可避不純物であるＣ３６（（Ｍｇ，Ａｌ）２Ｃａ）型化合物及びＣ１４（Ｍｇ２Ｃａ）型化合物が晶出し易くなり脆化し易くなるという問題が生じ、マンガンが上記数値範囲を超えると不可避不純物であるＡｌ−Ｍｎ系の化合物が晶出して脆化してしまうからである。また、アルミニウムとカルシウムの割合は約１：１の割合で含有させるのが好ましいが、多少の誤差を考慮し、アルミニウムとカルシウムの割合は０．９０〜１．１０：１．１０〜０．９０の範囲で適宜設定する。Ｃａ／Ａｌ比が１未満であるとカルシウムを含有させることによる耐熱性及び難燃性向上効果が十分でなく、１を超えると耐熱性及び難燃性向上効果が頭打ちとなるからである。 The content of each element is preferably set appropriately in the range of 0.5 to 1.0% by mass for aluminum and calcium and in the range of 0.30% by mass or less for manganese. When the aluminum content exceeds the above value or the calcium content is less than the above value, the inevitable impurities C36 ((Mg, Al) 2 Ca) type compound and C15 (Al 2 Ca) type compound crystallize out. When the calcium content exceeds the above numerical value or the aluminum content is less than the above numerical value, the C36 ((Mg, Al) 2 Ca) type compound that is an inevitable impurity and The problem is that the C14 (Mg 2 Ca) type compound is easily crystallized and easily embrittled, and if manganese exceeds the above numerical range, an inevitable impurity Al—Mn compound is crystallized and embrittled. is there. The ratio of aluminum to calcium is preferably about 1: 1, but considering some errors, the ratio of aluminum to calcium is 0.90 to 1.10: 1.10 to 0.90. Set appropriately within the range. This is because if the Ca / Al ratio is less than 1, the effect of improving heat resistance and flame retardancy due to the inclusion of calcium is not sufficient, and if it exceeds 1, the effect of improving heat resistance and flame retardancy reaches a peak.
また、本実施例においては、圧下率５０％／パスで且つ３００℃で粗圧延加工を行い、続いて圧下率３０％／パスで且つ２００℃で仕上圧延加工を行うことで製造した。具体的には、厚さ２５ｍｍの板状の上記マグネシウム合金に、試料温度を４００℃としロール温度を３００℃として圧延速度２０ｍ／ｍｉｎ、圧延パス数２パスで粗圧延加工を行い、中間熱処理として２００℃で０．５ｈ保持した後、試料温度を２００℃としロール温度を２００℃として圧延速度２０ｍ／ｍｉｎ、圧延パス数３パスで仕上圧延加工を行うことで、厚さ２．０ｍｍの板状のマグネシウム合金圧延材を得た。また、この際、潤滑剤として黒鉛系潤滑剤（スーパーコロハイト等）を使用した。 Further, in this example, it was manufactured by performing rough rolling at 300 ° C. with a reduction rate of 50% / pass, and then finish rolling at 200 ° C. with a reduction rate of 30% / pass. Specifically, the plate-like magnesium alloy having a thickness of 25 mm is subjected to rough rolling with a sample temperature of 400 ° C., a roll temperature of 300 ° C., a rolling speed of 20 m / min, and a rolling pass number of 2 passes, and an intermediate heat treatment After holding at 200 ° C. for 0.5 h, the sample temperature is set to 200 ° C., the roll temperature is set to 200 ° C., and finish rolling is performed at a rolling speed of 20 m / min and a rolling pass number of 3 passes, thereby obtaining a plate shape having a thickness of 2.0 mm. A magnesium alloy rolled material was obtained. At this time, a graphite-based lubricant (such as Super Coroheite) was used as the lubricant.
尚、粗圧延加工時の圧下率は４０〜６０％の範囲で適宜設定し、加熱温度は３００〜４００℃の範囲で適宜設定する。圧下率が上記数値範囲外となると動的再結晶が十分に生じず、結晶粒微細化が不十分なため組織が不均一となり、加熱温度が上記数値範囲外となると端割れや板自体の割れが生じるからである。また、仕上圧延加工時の圧下率は１５〜３５％の範囲で適宜設定し、加熱温度は２００〜３００℃の範囲で適宜設定する。圧下率が上記数値範囲外となると動的再結晶が十分に生じず、結晶粒微細化が不十分なため組織が不均一となり、加熱温度が上記数値範囲外となると端割れや板自体の割れが生じ、また、結晶粒の粗大化という問題が生じるからである。また、圧延速度は速い方が好ましいが５〜２０ｍ／ｍｉｎの範囲及びそれ以上の速度で適宜設定する。圧延速度が増加すると、ミクロ組織の均一性が向上し、その結果、伸びの増加及び異方性の改善が図れるからである。 In addition, the rolling reduction at the time of rough rolling is appropriately set within a range of 40 to 60%, and the heating temperature is appropriately set within a range of 300 to 400 ° C. When the rolling reduction is out of the above numerical range, dynamic recrystallization does not occur sufficiently, the crystal grain refinement is insufficient and the structure becomes non-uniform, and when the heating temperature is out of the above numerical range, end cracks or cracks in the plate itself. This is because. Moreover, the rolling reduction at the time of finish rolling is suitably set in the range of 15 to 35%, and the heating temperature is appropriately set in the range of 200 to 300 ° C. When the rolling reduction is out of the above numerical range, dynamic recrystallization does not occur sufficiently, the crystal grain refinement is insufficient and the structure becomes non-uniform, and when the heating temperature is out of the above numerical range, end cracks or cracks in the plate itself. This is because a problem of coarsening of crystal grains occurs. Moreover, although the one where a rolling speed is faster is preferable, it sets suitably in the range of 5-20 m / min and more. This is because when the rolling speed is increased, the uniformity of the microstructure is improved, and as a result, the elongation can be increased and the anisotropy can be improved.
以上のマグネシウム合金及び圧延加工により製造されたマグネシウム合金圧延材から、採取方向を圧延方向に対し０°、４５°、９０°として夫々採取したサンプルの各引張強さ、０．２％耐力及び伸びを夫々評価したところ、図１（ＡＸＭ０５０５０３）に図示したように、引張強さは２００ＭＰａ、０．２％耐力は１５０ＭＰａ、伸びは１５％以上であった。また、引張強さ、０．２％耐力及び伸び（引張特性）は、ひずみ速度：１×１０−３ｓ−１、試験温度：室温、試験片寸法：ＪＩＳ１４Ｂで、夫々評価した。 Tensile strength, 0.2% proof stress and elongation of samples taken from the above magnesium alloy and rolled magnesium alloy material produced by rolling, with the sampling direction being 0 °, 45 ° and 90 ° with respect to the rolling direction. As shown in FIG. 1 (AXM050503), the tensile strength was 200 MPa, the 0.2% proof stress was 150 MPa, and the elongation was 15% or more. Moreover, tensile strength, 0.2% yield strength, and elongation (tensile property) were evaluated by strain rate: 1 × 10 −3 s −1 , test temperature: room temperature, test piece size: JIS14B, respectively.
また、図１中、ＡＸＭ１０１００３は、１．０質量％のアルミニウムと、１．０質量％のカルシウムと、０．３０質量％のマンガンとを含有し、残部がマグネシウム及び不可避不純物から成り、粗圧延加工前に、５００℃で２４ｈ保持し、その後、空冷する均質化処理を施したマグネシウム合金（均質化材）を用いて上記同様の条件で圧延したサンプルであり、ＡＸＭ０５０５０３に比し伸びは若干下回るものの、引張強さ及び０．２％耐力に優れるものとなる。 Further, in FIG. 1, AXM101003 contains 1.0% by mass of aluminum, 1.0% by mass of calcium, and 0.30% by mass of manganese, and the balance is made of magnesium and inevitable impurities, and is roughly rolled. It is a sample rolled under the same conditions as described above using a magnesium alloy (homogenized material) that is kept at 500 ° C. for 24 hours before being processed and then air-cooled and subjected to homogenization, and the elongation is slightly lower than that of AXM050503 However, it has excellent tensile strength and 0.2% proof stress.
これは、上記マグネシウム合金は３００〜４００℃で圧延する際に５０％以上の絞りを示す加工性に優れたものであり、しかも、粗圧延加工時の圧下率を５０％と大きく設定することで、１パス当たりのひずみ量を大きくすることが可能となり、再結晶率の向上を図ることができ、それだけ動的再結晶による結晶微細化が促進され、微細結晶粒の集合組織が形成されることで強度的にも優れたものとなるからと考えられる。 This is because the magnesium alloy is excellent in workability showing a drawing of 50% or more when rolled at 300 to 400 ° C., and the rolling reduction during rough rolling is set as large as 50%. The strain amount per pass can be increased, the recrystallization rate can be improved, the crystal refining by dynamic recrystallization is promoted, and the texture of fine crystals is formed. This is considered to be because of excellent strength.
従って、本実施例は、優れた機械的性質を発揮可能で且つ低コストで製造可能な極めて実用性に優れたマグネシウム合金圧延材を得ることが可能なマグネシウム合金圧延材の製造方法となる。 Therefore, the present embodiment is a method for producing a magnesium alloy rolled material that can exhibit excellent mechanical properties and can be produced at a low cost and can be obtained at a very practical level.
以下、０．５〜３．５質量％のアルミニウム（Ａｌ）と、０．５〜３．５質量％のカルシウム（Ｃａ）と、０．３０質量％以下のマンガン（Ｍｎ）とを含有し、残部がマグネシウム（Ｍｇ）及び不可避不純物から成り、前記アルミニウム（Ａｌ）と前記カルシウム（Ｃａ）とを０．９０〜１．１０：１．１０〜０．９０の割合で含有するマグネシウム合金を圧延加工して成るマグネシウム合金圧延材が優れた機械的性質を発揮できる裏付けとなる実験例について説明する。 Hereinafter, 0.5 to 3.5% by mass of aluminum (Al), 0.5 to 3.5% by mass of calcium (Ca), and 0.30% by mass or less of manganese (Mn), A magnesium alloy containing the balance of magnesium (Mg) and inevitable impurities and containing the aluminum (Al) and the calcium (Ca) in a ratio of 0.90 to 1.10: 1.10 to 0.90 is rolled. An experimental example will be described which supports the rolled magnesium alloy material having excellent mechanical properties.
［実験例１］
アルミニウムとカルシウムとが含有されたマグネシウム合金（鋳造まま材）において、アルミニウムとカルシウムの含有量を夫々、０．５質量％ずつ（計１．０質量％）、１．０質量％ずつ（計２．０質量％）、１．５質量％ずつ（計３．０質量％）、２．０質量％ずつ（計４．０質量％）、３．５質量％ずつ（計７．０質量％）とした各サンプルに、ラム速度０．１ｍｍ／ｓｅｃ、押出温度を３５０℃（３５０℃で１０ｍｉｎ保持後に押出、その後、空冷）、押出比を２０に夫々設定した間接押出法により押出加工を行い、引張特性をひずみ速度：１×１０−３ｓ−１、試験温度：室温、試験片寸法：ＪＩＳ１４Ａで評価したところ、図２に図示したように、いずれのサンプルにおいても、引張強さ２５０ＭＰａ以上、０．２％耐力２００ＭＰｓ以上、伸び４％以上となることが確認できた。また、含有量を１．０質量％ずつ〜２．０質量％ずつとしたサンプルにおいては、引張強さ及び０．２％耐力が３００ＭＰａ程度若しくはそれ以上となり、且つ、伸びも６％以上となることから、この範囲が特に好ましい範囲であると考えられる。
[Experimental Example 1]
In a magnesium alloy (as cast material) containing aluminum and calcium, the contents of aluminum and calcium are 0.5% by mass (1.0% by mass in total) and 1.0% by mass (2 in total), respectively. 0.0% by mass), 1.5% by mass (total 3.0% by mass), 2.0% by mass (total 4.0% by mass), 3.5% by mass (total 7.0% by mass) Each sample was subjected to extrusion by an indirect extrusion method in which the ram speed was 0.1 mm / sec, the extrusion temperature was 350 ° C. (extrusion after holding at 350 ° C. for 10 minutes, and then air cooling), and the extrusion ratio was set to 20, respectively. When the tensile properties were evaluated according to strain rate: 1 × 10 −3 s −1 , test temperature: room temperature, test piece size: JIS14A, as shown in FIG. 0.2% yield strength 20 MPs above, it was confirmed that a growth of 4% or more. Moreover, in the sample whose content is 1.0% by mass to 2.0% by mass, the tensile strength and 0.2% proof stress are about 300 MPa or more, and the elongation is also 6% or more. Therefore, this range is considered to be a particularly preferable range.
［実験例２］
アルミニウムとカルシウムとが含有されたマグネシウム合金（鋳造まま材）において、アルミニウムとカルシウムの含有量を夫々２．０質量％ずつとし、マンガンの含有量を夫々、０質量％、０．０５質量％、０．１５質量％、０．３０質量％とした鋳造押出材サンプル、並びに、鋳造まま材の代わりに均質化材を用いた以外は上記鋳造押出材サンプルと同様の均質化押出材サンプルに、上記実験例１と同様の条件で押出加工を行い、上記実験例１と同様に引張特性を評価したところ、図３に図示したように、引張強さ及び０．２％耐力はマンガンの含有量が増えるほど向上することが確認でき、伸びはマンガンを少量含有するサンプルよりもより多く含有する方が向上することが確認できた。これより、マンガンを含有させることで、実験例１に比し引張特性が向上することが確認できた。また、鋳造まま材を用いた鋳造押出材の方がより優れた特性を発揮することが確認できた。
[Experiment 2]
In a magnesium alloy (as cast) containing aluminum and calcium, the contents of aluminum and calcium are each 2.0% by mass, and the contents of manganese are 0% by mass and 0.05% by mass, respectively. A cast extruded material sample of 0.15% by mass and 0.30% by mass, and a homogenized extruded material sample similar to the cast extruded material sample except that a homogenized material was used instead of the as-cast material. Extrusion was carried out under the same conditions as in Experimental Example 1, and the tensile properties were evaluated in the same manner as in Experimental Example 1. As shown in FIG. 3, the tensile strength and 0.2% proof stress were determined by the manganese content. It was confirmed that the increase was increased, and the elongation was confirmed to be improved by adding more than the sample containing a small amount of manganese. From this, it was confirmed that the inclusion of manganese improves the tensile properties as compared with Experimental Example 1. Moreover, it was confirmed that the cast extruded material using the as-cast material exhibits more excellent characteristics.
［実験例３］
実験例２と同様のサンプルの圧縮強さ及び引張強さを評価したところ、図４に図示したように、マンガンを含有させることで、圧縮耐力はＡＺ３１押出まま材に比し１００〜１１７ＭＰａ程度向上し、引張耐力は１３０〜１６９ＭＰａ程度向上することが確認できた。図４より、鋳造まま材を用いた鋳造押出材の方がより優れた特性を発揮することが確認できた。
[Experiment 3]
When the compressive strength and tensile strength of the sample similar to Experimental Example 2 were evaluated, as shown in FIG. 4, by including manganese, the compressive yield strength was improved by about 100 to 117 MPa as compared with the extruded AZ31 material. It was confirmed that the tensile strength was improved by about 130 to 169 MPa. From FIG. 4, it was confirmed that the cast extruded material using the as-cast material exhibits more excellent characteristics.
以上から、０．５〜３．５質量％のアルミニウムと、０．５〜３．５質量％のカルシウムと、０．０５〜０．３０質量％のマンガンとを含有し、残部がマグネシウム及び不可避不純物から成り、前記アルミニウムと前記カルシウムとを約１：１の割合で含有するマグネシウム合金を用いることで、極めて優れた機械的性質を有するマグネシウム合金押出材を製造できることが確認でき、押出加工と同様に塑性加工である圧延加工により形成される圧延材おいても同様の結果が推測されることから、上記マグネシウム合金を用いることで優れた機械的性質を発揮するマグネシウム合金圧延材が製造できると考えられる。 From the above, 0.5 to 3.5% by mass of aluminum, 0.5 to 3.5% by mass of calcium, 0.05 to 0.30% by mass of manganese, with the balance being magnesium and unavoidable It can be confirmed that a magnesium alloy extrudate having extremely excellent mechanical properties can be produced by using a magnesium alloy comprising impurities and containing aluminum and calcium in a ratio of about 1: 1. The same results are also expected for rolled material formed by rolling, which is plastic processing, and it is considered that a magnesium alloy rolled material exhibiting excellent mechanical properties can be produced by using the magnesium alloy. It is done.
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| JP2000104137A (en) * | 1998-09-30 | 2000-04-11 | Mazda Motor Corp | Magnesium alloy forging stock, forged member and production of the forged member |
| JP3030338B1 (en) * | 1998-10-05 | 2000-04-10 | 工業技術院長 | Method for producing high-strength flame-retardant magnesium alloy |
| US6904954B2 (en) * | 2001-04-09 | 2005-06-14 | Sumitomo Electric Industries, Ltd. | Magnesium alloy material and method of manufacturing the alloy material |
| JP2003328065A (en) * | 2002-05-10 | 2003-11-19 | Toyo Kohan Co Ltd | Wrought magnesium thin-sheet superior in formability, and manufacturing method therefor |
| JP5268127B2 (en) * | 2006-12-25 | 2013-08-21 | 国立大学法人長岡技術科学大学 | Manufacturing method of magnesium sheet for stretch |
| JP5125995B2 (en) * | 2008-11-04 | 2013-01-23 | 住友電気工業株式会社 | Magnesium alloy wrought material |
| JP5327515B2 (en) * | 2008-11-14 | 2013-10-30 | 株式会社豊田自動織機 | Magnesium alloys for casting and magnesium alloy castings |
| JP2010156007A (en) * | 2008-12-26 | 2010-07-15 | Mitsubishi Alum Co Ltd | Magnesium-alloy sheet excellent in corrosion resistance and surface treatability, and method for producing the same |
| JP2010242146A (en) * | 2009-04-03 | 2010-10-28 | Toyota Central R&D Labs Inc | Magnesium alloy and magnesium alloy member |
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2009
- 2009-09-30 JP JP2009227673A patent/JP5424391B2/en not_active Expired - Fee Related
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