Plastic anisotropy and deformation behavior of extruded Mg-Y sheets at elevated temperatures
Plastic anisotropy and deformation behavior of extruded Mg-Y sheets at elevated temperatures
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高温下挤压 Mg-Y 片材的塑性各向异性和变形行为
DOI：
10.1016/j.msea.2017.06.047
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发表时间：
2017-07
期刊：
影响因子：
--
通讯作者：
Wang Q.D.
中科院分区：
文献类型：
--
作者：
Lu J.W.;Yin D.D.;Huang G.H.;Quan G.F.;Zeng Y.;Zhou H.;Wang Q.D.
研究了Mg-1 Y（wt%）和Mg-5 Y（wt%）挤压板材在25 ℃ ~ 300 ℃温度范围内沿着挤压方向（艾德）、横向（TD）和对角方向（DD）的拉伸力学性能、Lankford系数（r）和微观组织的塑性各向异性。在较低温度下，Mg-5 Y合金在这三个方向上表现出各向异性的变形行为，而在300 ℃时，Mg-5 Y合金在这三个方向上表现出各向同性的变形行为。两种板材的极限抗拉强度各向异性（UA）和延伸率各向异性（EA）对温度不敏感，而屈服强度各向异性（YA）分别从室温时的49.1%（Mg-1 Y）和40.2%（Mg-5 Y）显著降低到300 ℃时的7.2%和2.7%。随着温度的升高，Mg-1 Y各方向的r值先从0.66-1.4（RT）增加到0.81-1.98（200 ℃），然后下降到0.67-1.56（300 ℃），而Mg-5 Y各方向的r值从1.04-2.05（RT）下降到1.18-1.35（300 ℃）。在室温拉伸后，Mg-5 Y中观察到少量孪晶，而Mg-1 Y中出现大量孪晶。在室温下，孪晶的大量减少和基面织构的弱化使γ值从0.66（Mg-1 Y）提高到1.04（Mg-5 Y）。在300 ℃下，Mg-1 Y中出现了动态再结晶（DRX）晶粒，而Mg-5 Y中只有少量的DRX晶粒出现在晶界附近，这可能与Y原子的晶界偏聚密切相关。
The plastic anisotropy in terms of tensile mechanical property, Lankford coefficient (r), and microstructure evolution of as-extruded Mg-1Y (wt%) and Mg-5Y (wt%) sheets along the extrusion direction (ED), transverse direction (TD), and diagonal direction (DD) were investigated in detail at temperatures between 25 ℃ (RT) and 300 ℃. The sheets exhibited anisotropic deformation behavior at lower temperatures, and nearly isotropic for Mg-5Y at 300 ℃ in these three directions. For both sheets, the ultimate tensile strength anisotropy (UA) and elongation anisotropy (EA) was not sensitive to the temperature, while the yield strength anisotropy (YA) decreased significantly from 49.1% (Mg-1Y) and 40.2% (Mg-5Y) at RT to 7.2% and 2.7% at 300 ℃, respectively. The r values of Mg-1Y in all directions first increased from 0.66-1.4 (RT) to 0.81–1.98 (200 ℃) then decreased to 0.67–1.56 (300 ℃), while those of Mg-5Y decreased from 1.04-2.05 (RT) to 1.18–1.35 (300 ℃) with increasing temperature. Few twins were observed in Mg-5Y after tension at RT while large amounts of twins occurred in Mg-1Y. The huge reduction of twins and the weakened basal texture are believed to increase the r value from 0.66 (Mg-1Y) to 1.04 (Mg-5Y) at RT. At 300 ℃, dynamic recrystallized (DRX) grains appeared in Mg-1Y while only a few DRX grains showed up in the vicinity of grain boundaries in Mg-5Y, which may be closely related to grain boundary segregation of the yttrium atoms.
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