Al/Zn比对Mg-Al系镁合金组织及力学性能的影响  

Effect of Al/Zn Ratio on Microstructure and Mechanical Properties of Mg-Al Magnesium Alloy

作　　者：黄晓锋[1] 曹喜娟[2] 朱凯[2] 田载友[1] 毛祖莉[2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点试验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点试验室,甘肃兰州730050

出　　处：《铸造》2008年第9期938-941,共4页Foundry

基　　金：甘肃省自然科学基金项目(3ZS062-B25-026);兰州理工大学博士基金(SB01200406)

摘　　要：用金相显微镜、电子万能试验机、显微硬度仪等研究不同Al、Zn含量及Al/Zn比对MB1变形镁合金组织及力学性能的影响。试验结果表明,当含Al量相同时,随Zn含量增加,(即随Al/Zn比减小)晶粒尺寸呈先减小后增大再减小趋势。含Al量为2%和8%时,随Al/Zn比减小,抗拉强度先增大后减少,而Al量为5%时,随Al/Zn比减小抗拉强度先减小后增大。当Al/Zn=2/5时,抗拉强度达最大值240MPa。含Al量为2%和5%时,随Al/Zn比减小,伸长率逐渐降低。当含Al量为8%时,随Al/Zn比减小,伸长率先下降后上升。当Al/Zn=1(2Al2Zn)时,伸长率达最大值7.175%。The metallographic microscope, electronic universal materials testing machine and microhardness material testing machine are employed to analysis the effect of different AI/Zn ratios on the microstructure, mechanical properties of MB1. The result shows that when the content of AI are the same, with the increase of Zn, the grain size of the alloy decreases at first, then increases and at last decreases again. The result of mechanical properties test shows that when the content of AI is 2% and 8%, respectively, with the decrease of AI/Zn ratio, the tensile strength take on the tendency of increasing first and then descending, while when the content of AI is 5%, with the decrease of AI/Zn ratio, the tensile strength take on descending first and then increasing. When the content of AI is 2% and 5%, respectively, with the decrease of AI/Zn ratio, the elongation descends gradually, while when the content of AI reaches 8%, the elongation descends first and then increases. The elongation reaches the maximum 7.175%, as the AI/Zn ratio is equal to 1 （2Al2Zn）, and as the AI/Zn ratio is equal to 2/5, the tensile strength gets the maximum value of 240 MPa.

关 键 词：MB1变形镁合金 Al/Zn比 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]