Dynamic recrystallization of Mg and Mg–Y alloys: Crystallographic texture development
Dynamic recrystallization of Mg and Mg–Y alloys: Crystallographic texture development
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DOI：
10.1016/j.msea.2007.08.016
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发表时间：
2008-06
期刊：
影响因子：
6.4
通讯作者：
R. Cottam;J. Robson;G. Lorimer;B. Davis
中科院分区：
文献类型：
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作者：
R. Cottam;J. Robson;G. Lorimer;B. Davis
在观察到动态再结晶（DRX）的条件下，对纯镁和三种二元Mg-Y合金（0.23、0.84和2.71wt%Y）进行了平面应变压缩变形。测定了母晶和DRX晶粒在变形过程中结晶织构的发展。在所有合金中，除最高Y合金外，DRX晶粒的织构与母晶织构密切相关，这表明DRX织构受变形条件的支配，而不是优先形核或长大。在最高Y合金中，DRX织构是随机的，这也表明在该合金中，优先形核或生长不是织构形成的原因。观察到宏观织构发展的转变，从250°C的纯Mg变形到450°C的Mg - 2.71wt%Y变形。这可以归因于额外滑移模式的激活，以及孪生对变形的贡献随之减少。
Pure magnesium and three binary Mg–Y alloys (0.23, 0.84 and 2.71wt%Y) have been deformed in plane strain compression under conditions where dynamic recrystallization (DRX) is observed. The development of crystallographic texture during deformation has been determined for both the parent and DRX grains. In all but the highest Y alloy, the texture of the DRX grains was found to follow that of the parent grains closely in all alloys, implying that the DRX texture is dominated by the deformation conditions, rather than preferred nucleation or growth. In the highest Y alloy, the DRX texture is randomized, which also suggests that preferred nucleation or growth is not responsible for texture formation in this alloy. A transition in macrotexture development was observed in going from pure Mg deformed at 250°C, to Mg–2.71wt%Y deformed at 450°C. This can be attributed to activation of additional slip modes, and a concomitant decrease in the contribution of twinning to deformation.