Achieving ultra-low planar anisotropy and high stretch formability in a Mg-1.1Zn-0.76Y-0.56Zr sheet by texture tailoring via final-pass heavy reduction rolling
Achieving ultra-low planar anisotropy and high stretch formability in a Mg-1.1Zn-0.76Y-0.56Zr sheet by texture tailoring via final-pass heavy reduction rolling
复制标题
通过最终道次重压下轧制进行织构调整，在 Mg-1.1Zn-0.76Y-0.56Zr 板材中实现超低平面各向异性和高拉伸成形性
DOI：
10.1016/j.msea.2018.12.116
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发表时间：
2019-02-11
期刊：
影响因子：
6.4
通讯作者：
Ke, W.
中科院分区：
文献类型：
--
作者：
Shi, B. Q.;Xiao, Y. H.;Ke, W.
由于普通轧制法在较低压下量下形成“TD分裂”织构，Mg-Zn-RE合金板材在室温下的力学响应始终表现出平面各向异性。采用热力学设计的成分，对Mg-1.1Zn-0.76Y-0.56Zr合金铸态铸锭进行了终道次大压下轧制，以改善“TO-劈裂”织构。对比研究了轻压下轧制（LRR）和FHRR两种轧制工艺对该钢组织、织构、力学性能和拉伸成形性能的影响。退火后的LRR板表现出典型的“TD-分裂”织构，而退火后的FHRR板显示出独特的“条纹-线-分裂”织构，其中基底极相对于约40度的TD从ND向一些条纹-线倾斜约50度。特别关注这种织构的形成及其对力学响应中的平面各向异性的影响，主要是屈服和随之而来的应变硬化行为的表现，以及力学各向异性与拉伸成形性之间的关系。
The Mg-Zn-RE alloy sheets always exhibit planar anisotropy in mechanical response at ambient temperature, due to the formation of 'TD-split' texture fabricated by ordinary rolling approach with lower reductions. A novel final-pass heavy reduction rolling (FHRR) approach was thus developed and performed on the as-cast ingots of Mg-1.1Zn-0.76Y-0.56Zr alloy, the composition of which was designed by thermodynamic calculation, aiming to modify the 'TO-split' texture. We comparatively investigate the influences of rolling routes, including light reduction rolling (LRR) and FHRR, on the microstructure, texture, mechanical properties and related stretch formability. The as-annealed LRR sheet exhibits a typical 'TD-split' texture, whereas the as-annealed FHRR sheets reveal a unique 'oblique-line-split' texture, with the basal poles tilted by about 50 degrees from the ND towards some oblique-line with respect to about 40 degrees of TD. Special attentions were paid on the formation of such texture and their influences on the planar anisotropy in mechanical response, mainly as a manifestation of yielding and as-followed strain hardening behavior, as well as the relationship between the mechanical anisotropy and stretch formability.