热处理对含微量镧AZ91镁合金组织和性能的影响
Effect of Heat-Treatment on Microstructure and Properties of AZ91 Magnesium Alloy with Trace La
摘 要
用XRD、SEM、EDS和显微硬度仪等研究了固溶、时效处理对真空精炼的含0.164 8%(质量分数)镧AZ91镁合金显微组织和力学性能的影响。结果表明: 加入微量镧后的AZ91镁合金在410 ℃×24 h空冷固溶+170 ℃×30 h空冷时效后, 第二类β相大量析出, 且呈不连续层片状沿晶界两侧分布; 时效态含镧AZ91镁合金的抗拉强度、屈服强度、伸长率和显微硬度分别比铸态不含镧AZ91合金的提高了41.84%,65.08%,35.65%和47.62%; 其原因是微量镧改变了热处理中铝原子的扩散状态, 有效控制了第一、二类β-Mg17Al12相析出时的形态与分布。
时效
力学性能
显微组织
AZ91 magnesium alloy
aging
mechanical property
microstructure
Abstract
The influences of solution and aging treatments on microstructure and mechanical properties of AZ91 magnesium alloy with 0.164 8wt% La refined by vaccum process were studied by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, microhardness testing and so on. The results show that a great number of second β phases after solid (410 ℃×24 h air cooling) and aging treatments(170 ℃×30 h air cooling). Compared with cast magnesium alloy, the tensile strength, yield strength, elongation and hardness of aged AZ91 magnesium alloy with La increased by 41.84%, 65.08%, 35.65%, 47.62%, respectively. The reason was that the diffusion state of Al atoms was changed by trace La during heat treatment, and thus the morphology and distribution of first and second β-Mg17Al12 phases were controlled effectively.
中图分类号 TG166.4
所属栏目 试验研究
基金项目 山西省回国留学人员科研项目(2008-39)
收稿日期 2011/3/14
修改稿日期 2011/12/8
网络出版日期
作者单位点击查看
备注祁小叶(1984-), 女, 山西大同人, 硕士研究生。
引用该论文: QI Xiao-ye,ZHANG Jin-ling,LIU Lu,WANG She-bin,XU Bing-she. Effect of Heat-Treatment on Microstructure and Properties of AZ91 Magnesium Alloy with Trace La[J]. Materials for mechancial engineering, 2012, 36(3): 35～38
祁小叶,张金玲,刘璐,王社斌,许并社. 热处理对含微量镧AZ91镁合金组织和性能的影响[J]. 机械工程材料, 2012, 36(3): 35～38
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参考文献
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【7】王克勤,王国军,张金玲,等.AM60-xNd合金T4固溶时间的确定[J].太原理工大学学报,2011,42(1):67-68.
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【9】赵源华,陈云贵,唐永柏,等.AZ91+(0~2.0)%La铸造镁合金的组织和力学性能[J].稀有金属材料与工程,2010,39(5):843-847.
【10】马颖,潘振峰,张洪锋,等.热处理对AZ91D镁合金组织及力学性能的影响[J].兰州理工大学学报,2009,35(5):9-12.
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【12】罗承萍,肖晓玲,刘江文.AZ91Mg-Al合金中γ-Mg17Al12析出相的多重位向关系及{112}γ伪孪晶关系[J].金属学报,2002,38(7):709-714.
【13】唐伟,韩恩厚,徐永波,等.热处理对AZ80镁合金结构及性能的影响[J].金属学报,2005,41(11):1199-1206.
【14】张金玲.AZ91镁合金精炼及稀土元素La对其改性作用的研究[D].太原: 太原理工大学, 2007.
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