材料科学
挤压
合金
延伸率
降水
扫描电子显微镜
粒度
冶金
沉淀硬化
动态再结晶
晶界
材料的强化机理
再结晶(地质)
溶解
极限抗拉强度
微观结构
复合材料
化学工程
物理
工程类
古生物学
气象学
热加工
生物
作者
Adil Mansoor,Wenbo Du,Zijian Yu,Ning Ding,Junjian Fu,Feng Lou,Ke Liu,Shubo Li
标识
DOI:10.1016/j.jallcom.2021.162873
摘要
The Mg-12Gd-2Er-0.4Zr (GE122K) is fabricated by double extrusion, and the effects of grain refinement and precipitate evolution on the mechanical performance of the extruded alloys are deeply analyzed. Scanning electron microscope results spectacle that some bulky precipitates in the single extruded alloy are fragmented to fine precipitates during double extrusion and distribute linearly along the extrusion direction (ED). The fine precipitates exhibit the strongest dispersion strengthening effect, whereas the bulky precipitates act as crack resources and decrease the elongation. After double extrusion, a refined grain structure with an average grain size of 2.7 µm is achieved, which is attributed to dynamic recrystallization (DRX). Moreover, double extrusion boosts the content of rare-earth elements into the matrix by dissolving the fine precipitates. During aging, extensive β′ precipitates form in the double extruded alloy than in the single extrude alloy. As a result, refined grains and strong precipitation strengthening make a significant contribution to a high yield strength (YS) of 422 ± 1.59 MPa with an elongation (EL) of 6.5 ± 0.89% in the double extruded+peak-aged alloy (ACX2). The possible strengthening mechanisms are discussed, and it is found that grain refinement and precipitate strengthening are the main contributors to the high strength of the GE122K alloy.
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