Fabrication of MgAlZnMn alloy sheets with homogeneous fine-grained structures using high strain-rate rolling in a wide temperature range
Fabrication of MgAlZnMn alloy sheets with homogeneous fine-grained structures using high strain-rate rolling in a wide temperature range
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DOI：
10.1016/j.msea.2012.09.022
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发表时间：
2013
期刊：
影响因子：
6.4
通讯作者：
S. Q. Zhu;H. G. Yan;J. H. Chen;Y. Z. Wu;Y. G. Du;Xiaozhou Liao
中科院分区：
文献类型：
--
作者：
S. Q. Zhu;H. G. Yan;J. H. Chen;Y. Z. Wu;Y. G. Du;Xiaozhou Liao
由于镁合金的成形性较差，用常规轧制方法生产镁合金板材已十分困难。本文报道了高应变速率轧制(HSRR)在250-400℃的宽温度范围内成功地制备了镁合金板材，并与常规轧制的板材的组织、织构和力学性能进行了比较。HSRR板材比常规轧制板材具有更细小、更均匀的组织，这归因于在HSRR过程中连续操作的特定变形机制，包括高密度变形孪晶的形成，随后的连续动态再结晶(DRX)，以及先前DRX晶界的不连续DRX。与常规轧制的板材相比，高速钢轧制板的基面织构较弱，这是因为其具有完整的DRX。HSRR板材表现出优异的强度和良好的塑性，这是由于晶粒细化和均匀性、低位错密度和弱化的基面织构共同作用的结果。
It has been difficult to produce magnesium alloy sheets using conventional rolling due to the poor formability of magnesium alloys. Here we report that high strain-rate rolling (HSRR) has been successfully used to fabricate magnesium alloy sheets in a wide temperature range of 250–400°C. The microstructure, texture and mechanical properties of the HSRR sheets were compared with a conventionally rolled sheet. The HSRR sheets are all of much finer and more homogeneous microstructures than the conventionally rolled sheet, which is attributed to the specific deformation mechanisms operating consecutively during HSRR that include the formation of a high density of deformation twins, subsequent continuous dynamic recrystallization (DRX), as well as discontinuous DRX at the grain boundaries of the previous DRX grains. Compared with the conventionally rolled sheet, the HSRR sheets have a weaker basal texture because of the complete DRX. The HSRR sheets demonstrate both excellent strength and good ductility, resulted from the combined effects of grain refinement and homogeneity, low dislocation density and weakened basal texture.