Effect of Ti and Zr Combined Modification on Microstructures and Mechanical Properties of Mg95Y2.5Zn2.5 Alloy Containing LPSO and W Phases1 . Issue 7 (16th March 2017)

• Record Type: Journal Article
• Authors: Wu, Shouzhong; Ma, Yanbin; Zhang, Jinshan; Xu, Chunxiang; Niu, Xiaofeng; Liu, Wei
• Is Part Of: Advanced engineering materials. Volume 19:Issue 7(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-16
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201600839
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : In order to develop a high performance Mg–Y–Zn alloy containing LPSO phase in the condition of lower Y/Zn atomic ratio, the effect of Ti and Zr on microstructures and mechanical properties of Mg95 Y2.5 Zn2.5 alloy was investigated. Although the α‐Mg grains can be refined by adding Ti and Zr separately, the best refinement effect can be obtained by the combined addition of them. More importantly, the formation of LPSO phase was promoted by adding them in as‐cast Mg95 Y2.5 Zn2.5 alloy. Meanwhile, the growth model of W phase was transformed from divorced eutectic to cooperative eutectic. In this case, the LPSO/W interface became continuous, which degraded the mechanical properties of as‐cast alloys. After extrusion, the increased LPSO phase caused by adding Ti and Zr greatly improved the strength of as‐extruded alloy. Abstract : Mg93.1 Y2.5 Zn2.5 Ti1.6 Zr0.3 alloy has the best refinement effect due to the combined addition of Ti and Zr. Meanwhile, Ti and Zr promote the formation of LPSO and change the growth model of W phase. The increased LPSO phase does not enhance mechanical properties of as‐cast alloy, but rather greatly improves mechanical properties of as‐extruded alloy.