Microstructural evolution and mechanical properties of Mg95.5Y3Zn1.5 alloy processed by extrusion and ECAP
Microstructural evolution and mechanical properties of Mg95.5Y3Zn1.5 alloy processed by extrusion and ECAP
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挤压和ECAP加工Mg95.5Y3Zn1.5合金的显微组织演变和力学性能
DOI：
10.1007/s12540-014-2025-6
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发表时间：
2014-03
影响因子：
3.5
通讯作者：
Xiaoqin Zeng
中科院分区：
文献类型：
--
作者：
Bin Chen;Chen Lu;Dongliang Lin;Xiaoqin Zeng
研究了挤压+ECAP两步法制备Mg95.5Y3Zn1.5合金的工艺。结果表明，经ECAP变形后的Mg95.5Y3Zn1.5合金具有超细晶组织，具有优异的力学性能。ECAP后，Mg95.5Y3Zn1.5合金的平均晶粒尺寸细化到300 nm左右。在623 K下，经过1道次加工后，合金的屈服强度和抗拉强度分别达到最高值444.6 MPa和472.7 MPa。SAED分析表明，ECAP变形后的组织由大角度晶界和小角度晶界组成。随着ECAP道次的增加，大角度晶界的比例增加。Mg 95.5Y3Zn 1.5合金由于高钇和锌添加而含有高体积分数的X-Mg 12 ZnY相。在拉伸过程中，它加速了裂纹的扩展和合并，导致合金过早断裂和伸长率降低。
A Mg95.5Y3Zn1.5 alloy processed via a two-step processing route of extrusion plus ECAP has been investigated. It was found that the ECAP processed Mg95.5Y3Zn1.5 alloy contained ultrafine grains and exhibited excellent mechanical properties. After ECAP, the average grain size of Mg95.5Y3Zn1.5 alloy was refined to about 300 nm. The highest strengths, with yield strength of 444.6 MPa and ultimate tensile strength of 472.7 MPa, were obtained after 1 pass at 623 K. The SAED patterns indicated that the microstructure after ECAP consisted of both high angle and low angle grain boundaries. The fraction of high-angle boundaries increased with increasing numbers of ECAP passes. The Mg95.5Y3Zn1.5 alloy contained a high volume fraction of X-Mg12ZnY phase due to high yttrium and zinc addition. And, it accelerated the growth and coalescence of cracks during tensile testing, resulting in premature fracture and lower elongation of alloy.
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影响因子：
4.9
作者：
Bing Chen;Chen Lu;D. Lin;Xiaoqin Zeng
通讯作者：
Bing Chen;Chen Lu;D. Lin;Xiaoqin Zeng
DOI：
10.1016/s0921-5093(03)00494-5
发表时间：
2003-11
影响因子：
6.4
作者：
Tao Liu;W. Zhang;Shiqing Wu;C. Jiang;Shuiming Li;Yong Xu
通讯作者：
Tao Liu;W. Zhang;Shiqing Wu;C. Jiang;Shuiming Li;Yong Xu
影响因子：
6.2
作者：
K. Máthis;J. Gubicza;N. H. Nam
通讯作者：
K. Máthis;J. Gubicza;N. H. Nam
影响因子：
3
作者：
M. Zheng;Shen Xu;K. Wu;S. Kamado;Y. Kojima
通讯作者：
M. Zheng;Shen Xu;K. Wu;S. Kamado;Y. Kojima
影响因子：
6
作者：
V. Chuvil’deev;T. Nieh;M. Gryaznov;A. N. Sysoev;V. Kopylov
通讯作者：
V. Chuvil’deev;T. Nieh;M. Gryaznov;A. N. Sysoev;V. Kopylov