JP4415098B2 - Method for producing flame retardant magnesium alloy extruded material and extruded material - Google Patents
Method for producing flame retardant magnesium alloy extruded material and extruded material Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims description 32
- 239000000463 material Substances 0.000 title claims description 32
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims description 26
- 239000003063 flame retardant Substances 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000011575 calcium Substances 0.000 claims description 36
- 238000001125 extrusion Methods 0.000 claims description 25
- 239000011777 magnesium Substances 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 20
- 229910052791 calcium Inorganic materials 0.000 claims description 20
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 229910003023 Mg-Al Inorganic materials 0.000 claims description 7
- 230000005496 eutectics Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 description 15
- 229910000765 intermetallic Inorganic materials 0.000 description 12
- 238000005266 casting Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000011572 manganese Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018131 Al-Mn Inorganic materials 0.000 description 1
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018461 Al—Mn Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 240000001973 Ficus microcarpa Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Description
本発明は、カルシウムを添加した難燃性マグネシウム合金押出材の製造方法及びその押出材に係り、特に、金属間化合物（Ａｌ２Ｃａ）の晶出を抑制した難燃性マグネシウム合金押出材の製造方法及びその押出材難燃性マグネシウム合金押出材に関する。 The present invention relates to a method for producing a flame retardant magnesium alloy extruded material to which calcium is added and the extruded material , and in particular, the production of a flame retardant magnesium alloy extruded material in which crystallization of an intermetallic compound (Al 2 Ca) is suppressed. methods and the extruded material flame retardant magnesium alloy extruded material.
マグネシウム及びその合金は実用金属中で最も軽い金属であり、アルミニウム（Ａｌ）、亜鉛（Ｚｎ）、マンガン（Ｍｎ）などと合金化して用いられ、近年、携帯機器や自動車等の輸送機器の分野を始めとする様々な分野において適用されており、注目を集めている金属である。しかしながら、マグネシウムは非常に活性であり、溶解・鋳造時や切削・研磨時などに発火する虞があるため、十分に注意して取り扱わなければならない。 Magnesium and its alloys are the lightest metals among practical metals and are used by alloying with aluminum (Al), zinc (Zn), manganese (Mn), etc. It is a metal that is attracting attention because it has been applied in various fields including the beginning. However, since magnesium is very active and may ignite during melting / casting or cutting / polishing, it must be handled with great care.
本発明者らは、このように可燃性の高いマグネシウム合金に数パーセントのカルシウム（Ｃａ）を添加することによって発火温度を上げ、難燃性のマグネシウム合金が得られることを見出し、例えば、特開２０００−１０９９６３号公報（特許文献１）には、「高強度難燃性マグネシウム合金の製造方法」に係る発明を提案している。
しかし、アルミニウムが合金化されたマグネシウム合金にカルシウムを添加して難燃化すると、最も安定であるアルミニウムとカルシウムとの金属間化合物（Ａｌ２Ｃａ）が結晶粒界に晶出し、伸びを低下させ、鋳造材強度や塑性加工性を低下させる。また、Ａｌ２Ｃａはマグネシウム基地に固溶しえないため溶体化熱処理や時効析出熱処理等の熱処理性を低下させる。したがって、カルシウムを添加したＭｇ−Ａｌ系のマグネシウム合金を製品化するための大きな阻害要因となっている。 However, when calcium is added to a magnesium alloy alloyed with aluminum to make it flame retardant, the most stable intermetallic compound of aluminum and calcium (Al 2 Ca) crystallizes at the crystal grain boundary, reducing the elongation. , Reduce the strength of cast material and plastic workability. Moreover, since Al 2 Ca cannot be dissolved in the magnesium base, heat treatment properties such as solution heat treatment and aging precipitation heat treatment are reduced. Therefore, it is a major impediment to commercializing Mg-Al based magnesium alloys to which calcium is added.
本発明は、上記の事情に鑑みて創案されたものであり、その目的は、Ａｌ２Ｃａの晶出を抑え、合金の伸びを向上させ、鋳造材強度、塑性加工性及び熱処理性を改善した難燃性マグネシウム合金押出材の製造方法及びその押出材を提供することにある。 The present invention was devised in view of the above circumstances, and its purpose is to suppress the crystallization of Al 2 Ca, improve the elongation of the alloy, and improve the cast material strength, plastic workability and heat treatment properties. It is providing the manufacturing method of a flame-retardant magnesium alloy extrusion material, and its extrusion material .
上記の目的を達成すべく、本発明１に係る難燃性マグネシウム合金押出材の製造方法は、
１〜１２ｍａｓｓ％のアルミニウム及び０．２〜５．０ｍａｓｓ％のカルシウム、残部マグネシウムから成る難燃性マグネシウム合金押出材の製造方法であって、
マグネシウム及び０．２〜５．０ｍａｓｓ％のカルシウムを溶解した後、９８８Ｋ以上に昇温した上で１〜１２ｍａｓｓ％のアルミニウムを添加して溶解し、凝固させることを特徴とする。
In order to achieve the above object, a method for producing a flame retardant magnesium alloy extruded material according to the present invention 1 comprises:
1～12Mass% calcium aluminum and 0.2～5.0Mass%, a process for the preparation of the flame-retardant magnesium alloy extruded material and the balance of magnesium,
After magnesium and 0.2 to 5.0 mass% calcium are dissolved, the temperature is raised to 988 K or more, and then 1 to 12 mass% aluminum is added and dissolved to solidify.
上記難燃性マグネシウム合金押出材の製造方法において、３００℃以上で上記アルミニウム含有量におけるＭｇ−Ａｌ系合金の共晶温度未満の温度に保持した後、急冷して溶体化処理してもよい。 In the method for producing the flame-retardant magnesium alloy extruded material , the solution may be subjected to a solution treatment by rapid cooling after being kept at a temperature of 300 ° C. or higher and lower than the eutectic temperature of the Mg—Al-based alloy in the aluminum content.
また、上記のいずれかの難燃性マグネシウム合金押出材の製造方法により製造した難燃性マグネシウム合金押出材に塑性加工を施してもよい。 Moreover, you may give a plastic working to the flame-retardant magnesium alloy extrusion material manufactured by the manufacturing method of one of said flame-retardant magnesium alloy extrusion materials .
本発明に係る難燃性マグネシウム合金押出材の製造方法及びその押出材によれば、組織制御によってアルミニウムとカルシウムとの金属間化合物（Ａｌ２Ｃａ）の晶出を抑え、合金の伸びを向上させることにより、鋳造材強度、塑性加工性及び熱処理性を改善することができるという優れた効果を発揮する。 According to the method for producing a flame-retardant magnesium alloy extruded material and the extruded material according to the present invention, the crystallization of an intermetallic compound of aluminum and calcium (Al 2 Ca) is suppressed by structure control, and the elongation of the alloy is improved. By this, the outstanding effect that cast material strength, plastic workability, and heat processing property can be improved is exhibited.
以下、本発明を実施するための最良の形態を図面に基づいて説明するが、本発明は本実施形態に限るものではない。
本実施形態の難燃性マグネシウム合金としては、マグネシウム（Ｍｇ）と共に、少なくとも、１〜１２ｍａｓｓ％のアルミニウム（Ａｌ）及び０．２〜５．０ｍａｓｓ％のカルシウム（Ｃａ）を含有するものであればよく、その他に亜鉛（Ｚｎ）、マンガン（Ｍｎ）、ジルコニウム（Ｚｒ）、イットリウム（Ｙ）、珪素（Ｓｉ）から選ばれる０．０１〜５．０ｍａｓｓ％の添加元素を含有していてもよい。このようなものとしては、例えば、アルミニウム及びカルシウムを上記割合で含有するＭｇ−Ａｌ系マグネシウム合金、Ｍｇ−Ａｌ−Ｚｎ系マグネシウム合金、Ｍｇ−Ａｌ−Ｍｎ系マグネシウム合金などが挙げられる。
The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to this embodiment.
As a flame-retardant magnesium alloy of this embodiment, if it contains at least 1-12 mass% aluminum (Al) and 0.2-5.0 mass% calcium (Ca) with magnesium (Mg). In addition, 0.01 to 5.0 mass% of an additive element selected from zinc (Zn), manganese (Mn), zirconium (Zr), yttrium (Y), and silicon (Si) may be contained. Examples of such a material include Mg—Al-based magnesium alloys, Mg—Al—Zn-based magnesium alloys, and Mg—Al—Mn-based magnesium alloys containing aluminum and calcium in the above proportions.
本実施の形態の難燃性マグネシウム合金は、次のようにして製造される。まず、マグネシウム、アルミニウム及びカルシウム以外の亜鉛やマンガン等の添加元素、並びに０．２〜５．０ｍａｓｓ％のカルシウムを、例えば、７００℃にて溶解する。カルシウムの添加量０．２〜５．０ｍａｓｓ％の範囲は、難燃性及び他の物性のバランスを図るために設定されている。すなわち、カルシウムの含有量が０．２ｍａｓｓ％未満では難燃効果が充分に発揮されず、５．０ｍａｓｓ％を超えるとその他の物性が低下するからである。 The flame retardant magnesium alloy of the present embodiment is manufactured as follows. First, additive elements such as zinc and manganese other than magnesium, aluminum and calcium, and 0.2 to 5.0 mass% of calcium are dissolved at, for example, 700 ° C. A range of 0.2 to 5.0 mass% of calcium is set in order to balance flame retardancy and other physical properties. That is, if the calcium content is less than 0.2 mass%, the flame retardant effect is not sufficiently exhibited, and if it exceeds 5.0 mass%, other physical properties are deteriorated.
次に、上記の溶湯を９８８Ｋ（約７１５℃）以上に昇温する。９８８Ｋ（約７１５℃）以上に昇温するのは、溶湯中に存在するマグネシウムとカルシウムとの金属間化合物（Ｍｇ２Ｃａ）を溶解させるためであり、例えば、上記溶湯を９９３Ｋ（約７２０℃）まで昇温してＭｇ２Ｃａを完全に溶解させる。 Next, the temperature of the molten metal is raised to 988K (about 715 ° C.) or higher. The reason why the temperature is raised to 988K (about 715 ° C) or more is to dissolve the intermetallic compound of magnesium and calcium (Mg 2 Ca) present in the molten metal. For example, the molten metal is heated to 993K (about 720 ° C). And the Mg 2 Ca is completely dissolved.
その後、この９９３Ｋ（約７２０℃）の溶湯中に１〜１２ｍａｓｓ％のアルミニウムを添加して溶解させた後、各種砂型、金型等への重力鋳造、ダイカスト法等による加圧鋳造法、連続鋳造法などによって鋳造して凝固させる。１〜１２ｍａｓｓ％のアルミニウムを添加するのは、マグネシウムに強度をもたせるためである。 Then, after adding 1-12 mass% of aluminum in this 993K (about 720 ° C) melt and dissolving it, gravity casting to various sand molds, dies, etc., pressure casting method by die casting method, continuous casting, etc. Cast and solidify by methods. The reason why 1 to 12 mass% of aluminum is added is to give magnesium strength.
このような製造方法により製造された本実施の形態の難燃性マグネシウム合金は、マグネシウムにアルミニウムを溶解するよりも前にカルシウムを溶解することによって、マグネシウム基地に固溶し易いＭｇ２Ｃａを主としてＭｇ１７Ａｌ１２を晶出させ、マグネシウム基地に固溶し難いＡｌ２Ｃａの晶出を抑えることにより、合金の伸びを向上させることができる。 The flame-retardant magnesium alloy of the present embodiment manufactured by such a manufacturing method mainly contains Mg 2 Ca that is easily dissolved in a magnesium base by dissolving calcium before dissolving aluminum in magnesium. The elongation of the alloy can be improved by crystallizing Mg 17 Al 12 and suppressing the crystallization of Al 2 Ca that is difficult to dissolve in the magnesium matrix.
したがって、上記の製造方法により溶解されたマグネシウム合金を各種砂型、金型等への重力鋳造、ダイカスト法等による加圧鋳造法、連続鋳造法などによって鋳造することにより、鋳造材の伸び、強度を高めることができる。また、塑性加工性及び熱処理性も改善することができ、塑性加工や熱処理によって難燃性マグネシウム合金の機械的性質の向上が期待できる。 Therefore, by casting the magnesium alloy melted by the above production method by various types of sand molds, die casting, gravity casting, pressure casting method by die casting method, continuous casting method, etc., the elongation and strength of the cast material can be increased. Can be increased. In addition, plastic workability and heat treatment can be improved, and improvement in mechanical properties of the flame retardant magnesium alloy can be expected by plastic working and heat treatment.
すなわち、以上のようにして得られた凝固体を３００℃以上で上記アルミニウム含有量におけるＭｇ−Ａｌ系合金の共晶温度未満の温度に保持した後、水冷等により急冷して溶体化処理（Ｔ４処理）を施してもよい。溶体化処理することにより、上記凝固体に晶出した金属間化合物を固溶させて、過飽和固溶状態とすることができる。溶体化処理の加熱温度を３００℃以上で上記アルミニウム含有量におけるＭｇ−Ａｌ系合金の共晶温度未満に設定したのは、３００℃未満では固溶量が小さくなり、Ｍｇ−Ａｌ系合金の共晶温度に達して部分的な溶解を回避するためである。Ｍｇ−Ａｌ系合金の共晶温度はアルミニウムの含有量によっても異なるが、１〜１２ｍａｓｓ％のアルミニウム添加量では４３７℃であり、４３７℃未満であることが好ましい。 That is, the solidified body obtained as described above is kept at a temperature of 300 ° C. or higher and lower than the eutectic temperature of the Mg—Al based alloy in the above aluminum content, and then rapidly cooled by water cooling or the like to form a solution treatment (T4 Treatment). By performing the solution treatment, the intermetallic compound crystallized in the solidified body can be made into a solid solution to be in a supersaturated solid solution state. The heating temperature of the solution treatment is set to 300 ° C. or higher and lower than the eutectic temperature of the Mg—Al based alloy at the above aluminum content. This is because the crystal temperature is reached and partial dissolution is avoided. Although the eutectic temperature of the Mg—Al-based alloy varies depending on the aluminum content, the aluminum addition amount of 1 to 12 mass% is 437 ° C. and preferably less than 437 ° C.
このように鋳造等により得られた凝固体を溶体化処理（Ｔ４処理）することにより、過飽和固溶状態とすることができ、機械的強度を高めることができる。このように溶体化処理（Ｔ４処理）が可能であるので、人工時効析出処理（Ｔ６処理）への応用も期待できる。 Thus, by carrying out the solution treatment (T4 process) of the solidified body obtained by casting etc., it can be set as a supersaturated solid solution state and mechanical strength can be raised. Since solution treatment (T4 treatment) is possible in this way, application to artificial aging precipitation treatment (T6 treatment) can also be expected.
また、上記鋳造後の凝固体もしくは溶体化処理を施した凝固体に塑性加工を施してもよい。塑性加工は、金属の延性、展性などの塑性変形する性質を利用する加工法であり、例えば、押出し加工、圧延加工、鍛造加工、引抜き加工などの加工法があるが、後述する実施例では押出し加工を採用する。この塑性加工により、金属間化合物が破砕され、この破砕粒子が均一に分散するため、機械的強度が向上する。また、この塑性加工処理における温度は、合金の種類に応じて適宜設定されるが、例えば、１８０〜４２０℃の範囲で設定される。押出し加工を行う場合、押出し比が高い方が機械的強度を向上させる上で好ましいが、押出し比が高過ぎると強度の向上が殆ど期待できなくなり、むしろ装置の経済性が低下するので、一般的には１０〜１５０の範囲で設定される。 The solidified body after casting or the solidified body subjected to solution treatment may be subjected to plastic working. Plastic processing is a processing method that utilizes the properties of plastic deformation such as ductility and malleability of metals, and examples include processing methods such as extrusion processing, rolling processing, forging processing, and drawing processing. Adopt extrusion process. By this plastic working, the intermetallic compound is crushed and the crushed particles are uniformly dispersed, so that the mechanical strength is improved. In addition, the temperature in this plastic working process is appropriately set according to the type of alloy, and is set in the range of 180 to 420 ° C., for example. When performing extrusion processing, a higher extrusion ratio is preferable for improving mechanical strength. However, if the extrusion ratio is too high, improvement in strength can hardly be expected, and the economics of the apparatus is rather lowered. Is set in the range of 10 to 150.
このように鋳造後の凝固体もしくは溶体化処理を施した凝固体に塑性加工を施すことにより、塑性流動によって金属間化合物が破砕され、この破砕粒子が均一に分散するため、機械的強度をさらに向上させることができる。 By subjecting the solidified body after casting or the solidified body subjected to solution treatment to plastic processing in this way, the intermetallic compound is crushed by plastic flow, and the crushed particles are uniformly dispersed. Can be improved.
以下、本発明の実施例を詳細に説明するが、本発明はこれらの実施例に限るものではない。
〔実施例１〕
試料１として、純マグネシウム（Ｍｇ）１２００ｇを７００℃で溶解し、粒状の金属カルシウム（Ｃａ）２８．１ｇを添加して撹拌混合した。その後、溶湯温度を７２０℃まで昇温し、純アルミニウム（Ａｌ）７６．６ｇを添加し、φ５０×５ｔ×２３０Ｌのパイプ状の金型内に鋳造した。図１は、試料１の断面を５％氷酢酸により８秒間（室温）のエッチングを行った場合の断面組織を示す顕微鏡写真図である。
Examples of the present invention will be described in detail below, but the present invention is not limited to these examples.
[Example 1]
As Sample 1, 1200 g of pure magnesium (Mg) was dissolved at 700 ° C., and 28.1 g of granular metallic calcium (Ca) was added and stirred and mixed. Thereafter, the molten metal temperature was raised to 720 ° C., 76.6 g of pure aluminum (Al) was added, and the mixture was cast into a pipe-shaped mold having a diameter of 50 × 5 t × 230 L. FIG. 1 is a photomicrograph showing the cross-sectional structure of the sample 1 when the cross section of the sample 1 is etched with 5% glacial acetic acid for 8 seconds (room temperature).
また、試料２（比較材）として、アルミニウムを５．６〜６．４ｍａｓｓ％程度含有するマグネシウム合金（ＡＭ６０Ｂ）１３００ｇを７００℃で溶解し、粒状の金属カルシウム２８．６ｇを添加して撹拌混合し、７２０℃に昇温して上記試料１と同じ金型内に鋳造した。図２は、試料１と同様にしてエッチングを行ったＡＭ６０Ｂ＋２Ｃａ合金の断面組織を示す顕微鏡写真図である。図２に示す試料２（比較材）の断面組織ではカルシウムの添加によって結晶粒界に多数の金属間化合物（Ａｌ２Ｃａ＋Ｍｇ１７Ａｌ１２）が晶出しているのに対し、図１に示す試料１の断面組織では金属間化合物の量が少なくなっているのが判る。 As sample 2 (comparative material), 1300 g of a magnesium alloy (AM60B) containing about 5.6 to 6.4 mass% of aluminum is melted at 700 ° C., and 28.6 g of granular metallic calcium is added and mixed by stirring. The temperature was raised to 720 ° C. and cast in the same mold as that of Sample 1. FIG. 2 is a photomicrograph showing the cross-sectional structure of AM60B + 2Ca alloy etched in the same manner as Sample 1. In the cross-sectional structure of the sample 2 (comparative material) shown in FIG. 2, many intermetallic compounds (Al 2 Ca + Mg 17 Al 12 ) are crystallized at the crystal grain boundaries by the addition of calcium, whereas the sample 1 shown in FIG. It can be seen that the amount of the intermetallic compound is small in the cross-sectional structure.
さらに、試料３として、試料１を４００℃に加熱して１８時間保持した後、水冷する溶体化熱処理（Ｔ４処理）を施した。図３は、試料１，２と同様にしてエッチングを行った試料３の断面組織を示す顕微鏡写真図であり、結晶粒界に存在する金属間化合物の量がさらに減少している。図１に示す試料１の断面組織ではＡｌ２Ｃａを主とし、Ｍｇ１７Ａｌ１２が晶出しているが、図３に示す試料３の断面組織では溶体化熱処理（Ｔ４）によって金属間化合物が少なくなっていることから、Ｍｇ２Ｃａ＋Ａｌ２Ｃａと成っていると考えられる。 Further, as Sample 3, Sample 1 was heated to 400 ° C. and held for 18 hours, and then subjected to a solution heat treatment (T4 treatment) that was cooled with water. FIG. 3 is a photomicrograph showing the cross-sectional structure of Sample 3 etched in the same manner as Samples 1 and 2, and the amount of intermetallic compounds present at the crystal grain boundaries is further reduced. In the cross-sectional structure of sample 1 shown in FIG. 1, Al 2 Ca is mainly used and Mg 17 Al 12 is crystallized, but in the cross-sectional structure of sample 3 shown in FIG. 3, there are few intermetallic compounds by solution heat treatment (T4). Therefore, it is considered that Mg 2 Ca + Al 2 Ca is formed.
〔実施例２〕
実施例２は、実施例１において作製した試料１〜３に対して押出し加工を施し、その機械的特性を検証した。
下記表１は、試料１〜３を直径４０ｍｍ、長さ４０ｍｍに切削加工した後、押出し比１９．８、押出し温度４００℃で押出し加工を施した場合の初期押出し力の測定結果である。
[Example 2]
In Example 2, the samples 1 to 3 produced in Example 1 were subjected to extrusion processing, and the mechanical properties were verified.
Table 1 below shows measurement results of initial extrusion force when samples 1 to 3 are cut into a diameter of 40 mm and a length of 40 mm, and then subjected to extrusion at an extrusion ratio of 19.8 and an extrusion temperature of 400 ° C.
また、図４に示すように、押出し加工による塑性流動によって、金属間化合物は粒子状に破砕され、合金マトリックス中に破砕粒子が均一に分散している。
下記の表２は、試料１，３、及び試料２（比較材）を試料３と同じ条件で溶体化熱処理（Ｔ４）した試料４の引張り強さと伸びを示している。
Table 2 below shows the tensile strength and elongation of Sample 1 and Sample 3 and Sample 4 (Comparative Material) obtained by solution heat treatment (T4) under the same conditions as Sample 3.
〔実施例３〕
実施例１と同様の方法で、直径１７０ｍｍ、長さ６００ｍｍの金型内に鋳造したものを、直径１５０ｍｍ、長さ４１０ｍｍの６インチビレットに切削加工した後、１６５０ｔｏｎの横型押出し機を用い、３８０℃において直径１４ｍｍ（押出し比１１８）の丸棒に押出し加工したときの押出し力、最大押出速度を測定した。その測定結果を下記表３に示している。
Example 3
After casting into a 6-inch billet with a diameter of 150 mm and a length of 410 mm, a product cast in a mold having a diameter of 170 mm and a length of 600 mm in the same manner as in Example 1, and using a 1650 ton horizontal extruder, 380 The extrusion force and the maximum extrusion speed when extruding into a round bar having a diameter of 14 mm (extrusion ratio 118) at 0 ° C. were measured. The measurement results are shown in Table 3 below.
Claims (4)
マグネシウム及び０．２〜５．０ｍａｓｓ％のカルシウムを溶解した後、９８８Ｋ以上に昇温した上で１〜１２ｍａｓｓ％のアルミニウムを添加して溶解し、凝固させることを特徴とする難燃性マグネシウム合金押出材の製造方法。 A method for producing a flame retardant magnesium alloy extruded material comprising 1 to 12 mass% aluminum, 0.2 to 5.0 mass% calcium, and the balance magnesium,
A flame-retardant magnesium alloy characterized by melting magnesium and 0.2-5.0 mass% calcium, then heating to 988K or higher, adding 1-12 mass% aluminum, melting and solidifying Extruded material manufacturing method.
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