Achieving ultra-high strength using densely ultra-fine LPSO phase

Changzheng Li ¹Huan Liu ²Yunchang Xin ³Bo Guan ¹Guangjie Huang ¹Peidong Wu ⁴Qing Liu³

扫码查看

作者信息

1. International Joint Laboratory for Light Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China
2. College of Mechanics and Materials,Hohai University,Nanjing 210000,China
3. Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 210009,China
4. Department of Mechanical Engineering,McMaster University,Hamilton,Ontario L8S 4L7,Canada
折叠

Abstract

Long period stacking ordered(LPSO)structures are an effective strengthening phase in Mg alloys.How-ever,the coarse LPSO phases in as-cast alloys are very difficult to refine,and they dramatically reduce the strengthening effect.In the present study,friction stir processing(FSP)was employed to refine the structure of an Mg-12.8Y-4.7Zn(wt％)alloy with a very high content of coarse LPSO phases.An opti-mized FSP regime refined the coarse LPSO phases into densely ultrafine blocks with an average width of～200 nm and an average length of～1 μm.An ultrahigh yield strength of～800 MPa was achieved under compression of the FSP region.Theoretical calculations indicated that the strengthening by the densely ultrafine LPSO phases was up to approximately 630 MPa.

Key words

Mg alloys/Strengthening/LPSO/Grain refinement

引用本文复制引用

基金项目

国家自然科学基金(52071039)

国家自然科学基金(51871032)

国家自然科学基金(51901068)

江苏省自然科学基金(BK20202010)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量27

段落导航