Microstructure, texture and mechanical properties of coarse-grained Mg–Gd–Y–Nd–Zr alloy processed by multidirectional forging
Microstructure, texture and mechanical properties of coarse-grained Mg–Gd–Y–Nd–Zr alloy processed by multidirectional forging
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DOI：
10.1016/j.jallcom.2014.10.084
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发表时间：
2015-02
影响因子：
6.2
通讯作者：
X. Xia;Qiang Chen;Zude Zhao;M. Ma;Xing-gang Li;Kui Zhang
中科院分区：
文献类型：
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作者：
X. Xia;Qiang Chen;Zude Zhao;M. Ma;Xing-gang Li;Kui Zhang
采用多向锻造（MDFed）技术对均匀化粗晶Mg-Gd-Y-Nd-Zr合金进行低温剧烈变形，研究了MDFed合金的显微组织、织构和拉伸性能。随着道次的增加，细小再结晶晶粒的体积分数显著增加，3道次后平均晶粒尺寸由200 μm减小到5.4 μm，但此后平均晶粒尺寸基本不变，6道次后均匀演变为平均晶粒尺寸为5.1 μm的超细晶粒。随着轧制道次的增加，基体织构逐渐减弱，这是动态再结晶、动态析出和轧制力方向变化共同作用的结果。屈服强度、极限抗拉强度和断裂伸长率随轧制道次的增加而提高。
Multidirectional forging (MDF) was applied to severely deform the homogenized coarse-grained Mg–Gd–Y–Nd–Zr alloy under decreasing temperature condition, and the microstructure, texture and tensile properties of the MDFed alloy were investigated in the current study. With the increase of MDF passes, the volume fraction of the fine recrystallized grains was remarkably increased, and the average grain size decreased from 200 μm to 5.4 μm after three MDF passes, but after that, the average grain size was almost unchanged, ultrafine grains (UFGs) with an average grain size of 5.1 μm were uniformly evolved after six MDF passes. The basal texture was gradually weakened with increasing the MDF passes, which resulted from cooperative effect of dynamic recrystallization, dynamic precipitation and the change direction of the MDF force. The yield strength, ultimate tensile strength and elongation to failure were enhanced with increasing the MDF passes.