固溶处理对Mg-8Al-1Zn-1Si-0.6Sb合金组织与力学性能的影响
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摘要
采用重力铸造法制备Mg-8Al-1Zn-1Si-0.6Sb合金,研究了固溶处理对该合金组织及力学性能的影响。结果表明,铸态合金主要由α-Mg、β-Mg_(17)Al_(12)、Mg_2Si、Mg Zn和Mg_3Sb_2相组成。对合金进行430℃×(8～32) h固溶处理,随保温的时间延长,Mg Zn相和β-Mg_(17)Al_(12)相固溶于α-Mg基体;粗大汉字状Mg_2Si相发生球状化;与此同时,合金的室温及高温(150℃)抗拉强度、屈服强度和伸长率逐步提高,硬度逐渐下降。铸态与固溶处理态合金的拉伸断裂形式均呈准解理脆性断裂。
Mg-8Al-1Zn-1Si-0.6Sb alloy was prepared by gravity casting. The effects of solution treatment on the microstructure and mechanical properties of the alloy were studied. The results show that the cast alloy is mainly composed ofα-Mg, β-Mg_(17)Al_(12), Mg_2Si, Mg Zn and Mg_3Sb_2 phases. The alloy is treated at 430 ℃ for 8-32 h. With the prolongation of the holding time, the Mg Zn phase and β-Mg_(17)Al_(12) phase are dissolved in α-Mg matrix. The spheroidization of bulky chinese character like Mg_2Si phase occurs. At the same time, the tensile strength, yield strength and elongation of the alloy at room and high temperature(150 ℃) increase gradually, and the hardness decrease gradually. The tensile fracture patterns of cast and solution treated alloys are quasi-cleavage brittle fracture.
Mg-8Al-1Zn-1Si-0.6Sb alloy was prepared by gravity casting. The effects of solution treatment on the microstructure and mechanical properties of the alloy were studied. The results show that the cast alloy is mainly composed ofα-Mg, β-Mg_(17)Al_(12), Mg_2Si, Mg Zn and Mg_3Sb_2 phases. The alloy is treated at 430 ℃ for 8-32 h. With the prolongation of the holding time, the Mg Zn phase and β-Mg_(17)Al_(12) phase are dissolved in α-Mg matrix. The spheroidization of bulky chinese character like Mg_2Si phase occurs. At the same time, the tensile strength, yield strength and elongation of the alloy at room and high temperature(150 ℃) increase gradually, and the hardness decrease gradually. The tensile fracture patterns of cast and solution treated alloys are quasi-cleavage brittle fracture.
引文
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[2]Yang M B,Pan F S,Shen J,et al.Comparison of Sb and Sr on modification and refinement of Mg2Si phase in AZ61-0.7Si magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2009,19:287-292.
[3]Lu Y Z,Wang Q D,Zeng X Q,et al.Effects of silicon on microstructure,fluidity,mechanical properties,and fracture behaviour of Mg-6Al alloy[J].Mater Sci.Technol.,2001,17:207-214.
[4]高爱华,陈昊,张建新.固溶态Mg-5Sn-1.5Al-1Zn-1Si合金的演化过程分析[J].热加工工艺,2015,44(20):185-187.
[5]Yuang G Y,Liu Z L,Wang Q D,et al.Microstructure refinement of Mg-Al-Zn-Si alloys[J].Mater Letters,2002,56:53-58.
[6]Srinivasan A,Pillai U T S,Pai B C.Microstructure and mechanical properties of Si and Sb added AZ91 magnesium alloy[J].Metall.Mater Trans.A,2005,36:2235-2243.
[7]Nam K Y,Song D H,Lee C W,et al.Modification of Mg2Si morphology in as-cast Mg-Al-Si alloys with strontium and antimony[J].Mater Sci Forum,2006,510:238-241.
[8]Yang M B,Pan F S,Cheng R J,et al.Comparison about effects of Sb,Sn and Sr on as-cast microstructure and mechanical properties of AZ61-0.7Si Mg alloy[J].Mater Sci.Eng.A,2008,489:413-418.
[9]Kim J J,Kim D H,Shin K S,et al.Modification of Mg2Si morphology in squeeze cast Mg-Al-Zn-Si alloys by Ca or P addition[J].Scripta.Mater,1999,41:333-340.
[10]Yoo M S,Shin K S,Kim N J.Effect of Mg2Si particles on the elevated temperature tensile properties of squeeze-cast Mg-Al alloys[J].Metall Mater Trans A,2004,35:1629-1632.
[11]宋佩维.往复挤压Mg-4Al-2Si镁合金的晶粒细化[J].中国有色金属学报,2010,20(4):606-612.
[12]张建新,高爱华,郭学锋,等.往复挤压工艺对Mg-5Sn-1.5Al-1Zn-1Si合金组织演变的影响[J].中国有色金属学报,2014,20(12):2979-2986.
[13]Lu Y Z,Wang Q D,Zeng X Q,et al.Behavior of Mg-6Al-x Si alloys during solution heat treatment at 420℃[J].Mater Sci Eng A,2001,301:255-258.
[14]Barbagallo S.Microstructural evolution of AS21X HPDC alloy during thermal treatment[J].Inter J Cast Metals Res,2004,17:370-375.
[15]Peng L,Chen G,Zhao Y T,et al.Influence of solution treatment on microstructure and properties of in-situ Mg2Si/AZ91Dcomposites[J].Transactions of Nonferrous Metals Society of China,2011,21:2365-2371.
[16]刘政,陈明,石凯.热处理对Mg2Si/Al-Si复合材料组织及性能的研究[J].铸造,2010,59(7):665-669.
[17]贾树卓,徐春杰,郭学锋,等.热处理对原位自生Mg2Si/Mg-Al基复合材料组织与性能的影响[J].材料热处理学报,2006,27(6):26-29.
[18]安运铮.热处理工艺学[M].北京:机械工业出版社,1982.
[19]Yang M B,Liang X F,Li H,et al.Effects of solution heat treatment on microstructure and mechanical properties of AZ61-0.7Si magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2010,20:416-420.
[20]宋佩维,郭学锋,井晓天,等.Mg-4Al-2Si合金固溶处理过程中Mg2Si相颗粒的球状化[J].材料工程,2007,35(3):34-37.