WO2007114345A1 - ダイカスト用Zn合金とその製造方法、ダイカスト合金用Al母合金 - Google Patents
ダイカスト用Zn合金とその製造方法、ダイカスト合金用Al母合金 Download PDFInfo
- Publication number
- WO2007114345A1 WO2007114345A1 PCT/JP2007/057122 JP2007057122W WO2007114345A1 WO 2007114345 A1 WO2007114345 A1 WO 2007114345A1 JP 2007057122 W JP2007057122 W JP 2007057122W WO 2007114345 A1 WO2007114345 A1 WO 2007114345A1
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- alloy
- mass
- rare earth
- earth elements
- die casting
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/027—Casting heavy metals with low melting point, i.e. less than 1000 degrees C, e.g. Zn 419 degrees C, Pb 327 degrees C, Sn 232 degrees C
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/02—Alloys based on zinc with copper as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
Definitions
- the present invention relates to a die-casting Zn alloy and a method for producing the same, and further relates to an A1 mother alloy for a die-casting alloy used in the producing method.
- Zinc (Zn) alloys have excellent mechanical properties and forgeability, and are thin and have complex shapes and precise dimensions. Therefore, zinc (Zn) alloys are widely used as alloys for die casting after aluminum (A1) alloys. It is used widely. In addition, Zn alloy for die casting is applicable to a wide range of surface treatments, excellent corrosion resistance, and low melting point, enabling die casting in a hot chamber. It has the advantage of being. For this reason, zinc alloys for die casting are widely used in automobile-related parts, machine parts, building hardware, ornaments, etc.
- Zn alloy for die casting As a Zn alloy for die casting that has been converted to JIS, two types of Zn alloy block for die casting in which A1 and magnesium (Mg) are added to Zn, and copper (Cu) of about lmass% are further added to this. There is one kind of Zn alloy lump for die casting. In addition, there are three types of die alloys that are not JIS-made, but include two types of Zn alloy ingots for die casting with about 3 mass% Cu added.
- the Zn alloy has a drawback that the specific gravity is larger than other die-cast alloys such as A1 alloy and Mg alloy, and resin materials. For this reason, the share of zinc alloys for die casting is being squeezed under the influence of weight reduction of automobiles and machines. In order to make up for these drawbacks, it is necessary to manufacture as thin a Zn alloy die-cast product as possible and reduce its weight.
- Patent Document 1 discloses a die-casting Zn alloy that can suppress the generation of cavity defects when commercialized by adding an appropriate amount of rare earth elements in addition to Al and Mg, and enables thinning. ing.
- Patent Document 1 JP 2005-89862 A
- the zinc alloy for die casting added with a rare earth element is excellent in the fluidity (melting fluidity) of the molten metal during die casting, and can suppress the generation of molten metal.
- the manufactured Zn alloy die-cast product void defects are reduced, surface defects and blister defects are reduced, and mechanical properties such as strength, elongation, and Young's modulus are improved. For this reason, the thickness can be reduced and the product can be reduced in weight.
- the amount of rare earth element added to suppress the occurrence of cavity defects is very small, and the rare earth element added to the molten Zn when the Zn alloy for die casting is melted.
- the rare earth element added to the molten Zn when the Zn alloy for die casting is melted When not solidly dispersed and solidified, there was a problem that rare earth elements segregated in the Zn alloy.
- rare earth elements do not dissolve and segregate. That is, when a conventional zinc alloy for die casting added with rare earth elements was subjected to EPMA measurement at any location, it was detected that rare earth elements were locally detected and segregated. If the rare earth elements are segregated in this way, the fluidity and hot water of the molten zinc will deteriorate. As a result, when it is commercialized, the generation of void defects cannot be sufficiently suppressed, and a homogeneous Zn alloy die-cast product cannot be obtained.
- An object of the present invention is to provide a zinc alloy for die casting in which rare earth elements are uniformly dispersed without segregation, and a method for producing the same.
- an A1 master alloy containing a rare earth element of 3 mass% or more and less than 10 mass% is added to the molten Zn. It was found that rare earth elements do not segregate in the Zn alloy when the rare earth elements are uniformly dispersed and solidified in the molten Zn. Add this A1 master alloy to melt The Zn alloy for die casting obtained by solidifying the obtained Zn alloy was found to have a crystal grain size of 10 ⁇ m or less.
- the present invention has been devised based on powerful knowledge.
- Al 3 to 5 mass%
- Mg 0.03 to 0.06 mass%
- one or more rare earth elements 0.01 to 0.5 mass%
- the balance being
- a Zn alloy for die casting is provided, which is composed of Zn and inevitable impurities and has a crystal grain size of 10 xm or less.
- Al 3-5 mass%, Mg: 0.03-0.06 mass%, one or more rare earth elements: 0.0:!-0.5 mass%
- Zn alloy for die casting characterized by containing Zn, the balance being inevitable impurities with Zn, and no intermetallic compound having a maximum intermetallic compound diameter of 20 ⁇ m or more.
- Cu 0.5 to 5 mass% may be contained.
- the difference between the crystal grain size on the surface and the crystal grain size on the inside is 10 when the forged product is solidified by melting again. Desirably within / o.
- an Al master alloy containing at least 3 mass% and less than lOmass% of one or more rare earth elements and the balance of A1 and inevitable impurities is added, and Al: 3 ⁇ 5 mass%, Mg: 0.03 ⁇ 0.06 mass%, one or more rare earth elements: 0.01 ⁇ 0.5 mass%, the balance is Zn alloy consisting of Zn and inevitable impurities
- Al 3 ⁇ 5 mass%
- Mg 0.03 ⁇ 0.06 mass%
- one or more rare earth elements 0.01 ⁇ 0.5 mass%
- the balance is Zn alloy consisting of Zn and inevitable impurities
- an A1 master alloy characterized by containing one or more rare earth elements in an amount of 3 mass% or more and less than lOmass%, with the balance being A1 and inevitable impurities. Is done.
- the rare earth element can be uniformly mixed, and the rare earth element Zn alloy for die casting can be manufactured without segregating.
- FIG. 1 SEM photograph of the die casting Zn alloy of Example 1.
- A1 improves the fluidity of the molten metal during die casting.
- Zn alloy for die casting is an alloy that can be used in hot chambers. If the content of A1 increases, the melting point becomes high and hot chambers may become difficult, so the amount of A1 added is 3-5 mass. % Is preferred.
- Mg is contained in order to suppress intergranular corrosion. If the content is small, the suppression effect is low, but if the content is large, the impact strength of the Zn alloy die-cast product may be lowered. Therefore, the addition amount is preferably 0.03 to 0.06 mass%.
- the addition of Cu can further improve the strength. However, if the addition amount increases, the fluidity and impact strength may be lowered. Therefore, when Cu is added, the addition amount is in the range of 0.5 to 5 mass%.
- Rare earth elements are 15 elements from lanthanum (La) force to lutetium (Lu), and by adding one or more of these rare earth elements, the occurrence of "nest" which is a cavity defect And can improve the mechanical properties of Zn alloy die-cast products.
- the rare earth element for example, misch metal is preferably added. Misch methanol is an aggregate or alloy of metals containing one or more rare earth elements. Examples of metal elements include La, cerium (Ce), neodymium (Nd), and praseodymium (Pr). is there. In particular, La is 15% and cerium (Ce) is 45. If it is at least 0 , the occurrence of cavity defects can be more reliably suppressed.
- the content of the rare earth element is 0.01 to 0.5 mass%, and preferably less than 0.2 mass%.
- the total content of these two or more rare earth elements is 0.01 to 0.5 mass%. More preferably, the total force of the contents of the two or more rare earth elements (for example, misch metal) is less than 0.2 mass%.
- the total content of these two or more rare earth elements is set to a low content of 0.01 to 0.15 mass%, the effect of reducing the void defects and the improvement of the flowability of the molten metal are achieved. Is also prominent.
- the melting time when producing an alloy ingot used for die casting can be shortened, which is preferable. It also contains rare earth elements. If the content exceeds 0.5 mass%, the dissolution time becomes longer, resulting in increased manufacturing costs and economic disadvantages.
- Zn having a purity of 99% or more is melted in a melting furnace, and one or two of Al, for example, Misch metal, etc. is dissolved in the molten Zn.
- Al 3 to 5 mass%, Mg: 0.03 to 0.06 mass%, one or more rare earth elements: 0.01 to 0.5 mass%, further, if necessary, Cu: A Zn alloy containing 0.5 to 5 mass% with the balance being Zn and inevitable impurities is melted.
- Al mother alloy containing rare earth elements of 3 mass% or more and less than 10 mass% with the balance being Al and inevitable impurities the rare earth elements can be uniformly mixed.
- a misch metal with a total of 50% or more of La and Ce is used as the rare earth element contained in this A1 master alloy, uniform mixing of the rare earth elements becomes easier and segregation is further suppressed, and the die-cast Zn alloy. Can be manufactured.
- the rare earth element can be uniformly dispersed in the produced die-cast Zn alloy by using an A1 mother alloy having a rare earth element content of 3 mass% or more and less than 10 mass%. And the crystal grain size in the Zn die-cast alloy is 10 ⁇ m or less.
- A1 mother alloy When manufacturing the A1 mother alloy, first, A1 is heated to 1000 ° C or higher and completely dissolved. One or more rare earth elements such as misch metal in the A1 molten metal Is added so that it becomes 3 mass% or more and less than 10 mass%. While maintaining the temperature of the molten metal at 1000 ° C or higher, magnetically stir for several hours and add misch metal. After that, the molten metal is cooled to 950 ° C and cast to make an A1 mother alloy with rare earth elements added.
- rare earth elements such as misch metal in the A1 molten metal
- the melt produced by melting the Zn alloy for die casting of the present invention thus produced has excellent fluidity (molten metal flow) and can suppress the occurrence of molten metal.
- the uniform dispersion of rare earth elements reduces the number of void defects, the number of surface defects and blister defects, and the strength, elongation, and Young's modulus.
- the mechanical properties are also improved. For this reason, the thickness can be reduced, and the weight of the product can be reduced. Therefore, it is possible to reduce the weight of the product.
- a zinc alloy die-cast product produced using the zinc alloy for die-casting of the present invention is suitably used for, for example, automobile-related parts, machine parts, building hardware, ornaments and the like.
- the raw material is melted and poured into a vertical mold, and then quenched with water. Therefore, the crystal grain size on the product surface becomes small, while the inside is not rapidly cooled, so it is difficult to make the crystal grain size as small as the surface.
- the Zn alloy for die casting of the present invention by dispersing the rare earth element, the crystal grain size can be reduced to the inside of the die-cast product.
- A1 master alloy In the melting furnace, Al was melted to obtain Al hot water. Next, the temperature of A1 hot water was raised to 1000 ° C. In this A1 hot water, add 53kg of Ce53%, La25% misch metal (rare earth element), stir and melt, and the composition of the A1 master alloy is 91mass% for A1, 9mass% for misch metal (rare earth element) It was. After confirming dissolution, the molten metal was poured from a melting furnace into a vertical mold at a temperature of 950 ° C, forged and cooled and solidified to obtain an A1 master alloy.
- Fig. 1 shows an SEM photograph of a cross section of the Zn alloy for die casting of Example 1.
- Figure 1 (a) is 2200 times and Figure 1 (b) is 1000 times.
- the crystal grain size of the structure was measured from an SEM photograph of 1000 times. The grain size was 5 to 10 ⁇ m, and the crystal grain size was uniform.
- the cross-sectional SEM photograph of the obtained Zn alloy was image-analyzed to obtain the shrinkage ratio. The shrinkage ratio was 0.20%, and the intermetallic compound with a maximum diameter of 1 / im or more was obtained. No generation was seen.
- the cross section of the Zn alloy was analyzed by EPMA, no segregation of rare earth elements was observed.
- Example 2 The same procedure as in Example 1 was performed except that the amount of misting metal applied in the A1 mother alloy was adjusted.
- the metal composition of the A1 mother alloy of Example 2 was 97 mass% for A1 and 3 mass% for misch metal.
- the composition of the die casting Zn alloy was the same as in Example 1.
- the crystal grain size of the structure was measured from an SEM photograph of 1000 times. As a result, the grain size was 5 to 10 zm, and the crystal grain size was uniform. . In addition, the shrinkage ratio was 0.15%, and no formation of intermetallic compounds with a maximum diameter of more than m was observed.
- the cross section of the Zn alloy was also analyzed by EPMA. No segregation was observed.
- the flow length of this zinc alloy at 420 ° C was 275 mm.
- Example 2 The same procedure as in Example 1 was performed except that the amount of misting metal applied in the A1 mother alloy was adjusted.
- the metal composition of the A1 mother alloy of Example 3 was 94 mass% for A1 and 6 mass% for misch metal.
- the composition of the die casting Zn alloy was the same as in Example 1.
- the crystal grain size of the structure was measured from an SEM photograph of 1000 times.
- the grain size was 5 to 10 zm, and the crystal grain size was evenly aligned.
- the shrinkage ratio was 0.11%, and formation of intermetallic compounds with a maximum diameter of l x m or more was not observed.
- the cross section of the Zn alloy was measured by EPMA, no segregation of rare earth elements was observed.
- the flow length of this Zn alloy at 420 ° C was 275 mm.
- a Zn alloy for die casting was prepared without adding misch metal.
- the composition of the Zn alloy for die casting was the same as that of Example 1 except that no misch metal was added.
- the crystal grain size of the structure was measured in the cross section of the Zn alloy for die casting of Comparative Example 1, the crystal grain size S was found to be 13 to 20 m, that is, ⁇ or more. Furthermore, the closing damage ij was high at 0.67%. The flow length of this Zn alloy at 420 ° C. was 290 mm.
- Example 2 The same procedure as in Example 1 was conducted except that the misch metal content of the A1 mother alloy was adjusted.
- the metal composition of the A1 master alloy of Comparative Example 2 was 88 mass% for A1 and 12 mass% for misch metal.
- the composition of the die casting Zn alloy was the same as in Example 1.
- Example 2 The same procedure as in Example 1 was conducted except that the misch metal content of the A1 mother alloy was adjusted. ratio The metal composition of the Al master alloy of Comparative Example 3 was 90 mass% for A1 and 10 mass% for misch metal. The composition of the die casting Zn alloy was the same as in Example 1.
- FIG. 2 shows an SEM photograph of the die casting Zn alloy of Comparative Example 3.
- Figure 2 (a) is 2200 times, Figure 2
- (b) is 1000 times.
- the crystal grain size of the structure was measured from an SEM photograph with a magnification of 1000 times. As a result, crystals with grain sizes of 5 to 15 ⁇ m and 10 ⁇ m or more were observed. The nest rate was 0.21%.
- Fig. 2 (a) white spots are seen.
- this part has a composition of Zn (about 77.5 mass%), La (about 15. Omass%), Ce (about 15. Omass%), segregated rare earth elements, It was found that an intermetallic compound was formed. It was observed that the intermetallic compound was dispersed in the Zn alloy, and it was confirmed that there was a large intermetallic compound having a maximum diameter of about 20 ⁇ m or more.
- A1 master alloy added in melting the die casting Zn alloys of Examples 1 to 3 and Comparative Examples 1 to 3 (Comparative Example 1 is A1) and Misch metal concentration (MM concentration),
- Figure 3 (Table 1) shows the crystal grain size and flow length at 420 ° C, the mischmetal concentration in the Zn alloy, the maximum diameter of the intermetallic compound, and the shrinkage ratio of the Zn alloy produced using the A1 master alloy.
- the present invention can be applied to, for example, the manufacturing field of automobile-related parts, machine parts, building hardware, ornaments, and the like.
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JP2008508660A JP5202303B2 (ja) | 2006-03-31 | 2007-03-30 | ダイカスト用Zn合金とその製造方法、ダイカスト合金用Al母合金 |
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CN102011029B (zh) * | 2010-12-08 | 2014-06-04 | 宁波博威合金材料股份有限公司 | 一种拉链牙带用锌合金及拉链牙带的制备方法 |
CN108546847B (zh) * | 2018-05-09 | 2020-03-10 | 江苏法尔胜缆索有限公司 | 一种超高强度大直径钢丝主缆索股锚固材料及灌锚方法 |
CN110669962B (zh) * | 2019-11-11 | 2021-03-09 | 湘潭大学 | 一种可降解生物医用Zn-Al-Mg-Nd锌合金及其制备方法 |
CN113275577A (zh) * | 2021-04-20 | 2021-08-20 | 广州湘龙高新材料科技股份有限公司 | 一种锌合金增材的制备方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6338551A (ja) * | 1986-08-01 | 1988-02-19 | Sekisui Chem Co Ltd | 希土類元素含有亜鉛基合金 |
JP2004523357A (ja) * | 2000-05-15 | 2004-08-05 | ワン,ル−ヤオ | アルミニウム・シリコン合金の鋳造時にシリコンを球状化する方法 |
JP2005089862A (ja) * | 2003-08-11 | 2005-04-07 | Dowa Mining Co Ltd | ダイカスト用Zn合金及びZn合金ダイカスト製品 |
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- 2007-03-30 JP JP2008508660A patent/JP5202303B2/ja active Active
- 2007-03-30 WO PCT/JP2007/057122 patent/WO2007114345A1/ja active Application Filing
- 2007-03-30 CN CNA2007800123122A patent/CN101437970A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6338551A (ja) * | 1986-08-01 | 1988-02-19 | Sekisui Chem Co Ltd | 希土類元素含有亜鉛基合金 |
JP2004523357A (ja) * | 2000-05-15 | 2004-08-05 | ワン,ル−ヤオ | アルミニウム・シリコン合金の鋳造時にシリコンを球状化する方法 |
JP2005089862A (ja) * | 2003-08-11 | 2005-04-07 | Dowa Mining Co Ltd | ダイカスト用Zn合金及びZn合金ダイカスト製品 |
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