Effect of LPSO orientation on the compression behavior and workability of the Mg-5Gd-3Y–1Zn-0.5Zr alloy
Effect of LPSO orientation on the compression behavior and workability of the Mg-5Gd-3Y–1Zn-0.5Zr alloy
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LPSO取向对Mg-5Gd-3Y×1Zn-0.5Zr合金压缩行为和加工性能的影响
DOI：
10.1016/j.msea.2022.144115
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发表时间：
2022-09
期刊：
影响因子：
--
通讯作者：
L.W. Lu
中科院分区：
文献类型：
--
作者：
X.J. Zhou;X.D. Yang;X.Z. Lu;J. Zhang;S.L. Yu;X.M. Chen;L.W. Lu
为了研究LPSO取向对镁合金压缩性能和加工性能的影响，对一种含一定量定向排列的LPSO相的Mg-5.3Gd-3.3Y-1.1Zn-0.5Zr(wt%)镁合金进行挤压处理，获得了双峰组织。随后的压缩实验表明，变形激活能(Q)在不同取向(ED、45°和Td)上接近(180-194kJ/mol)，由于有足够的初始晶界(i-Gb)，这一数值远低于未均质的Mg-Gd-Y-Zn-Zr合金。在较高的Zener-Holloman(Z)参数下，扭结和扭结带上的DRX增强导致Q略有下降，并使ED取向的最佳加工磁区移动。I-GBs掩盖了LPSO取向通过扭结变形对DRX比和可加工性的影响。随着Z参数的增大，DRXed的晶粒尺寸变小，组织和硬度趋于均匀。挤压合金不同的α-Mg和LPSO取向导致了压缩过程中峰值流动应力(σp)的各向异性和压缩后TD试件的异常椭圆形状。本工作为含LPSO的变形镁合金的工业化生产提供了有用的信息。
To investigate the effect of LPSO orientation on the compression behavior and workability of Mg alloys, a Mg-5.3 Gd-3.3 Y-1.1 Zn-0.5 Zr (wt%) alloy was extruded to obtain the bimodal microstructure with a certain amount of directionally arranged LPSO phases. The subsequent compression tests indicate that the values of activation energy of deformation (Q) are approaching (180–194 kJ/mol) along different orientations (ED, 45°, and TD), which are much lower compared with the as-homogenized Mg-Gd-Y-Zn-Zr alloys due to the sufficient initial grain boundaries (I-GBs). Enhanced kinking and DRX at kink bands at the higher Zener-Hollomon (Z) parameters result in the slight decrease of Q and the movement of optimal processing domains for the ED orientation. The I-GBs overshadow the effect of LPSO orientation via kinking deformation on the DRX ratio and workability. The increase of Z parameter tends to reduce the DRXed grain size and the homogeneity of both the microstructure and hardness. Different α-Mg and LPSO orientations of the extruded alloy induce the anisotropy of peak flow stress (σ p) during compression and the extraordinary elliptical shape of the compressed TD specimens. This work provides useful information for the industrial production of wrought LPSO-containing Mg alloys.
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时效%20行为%20of%20挤压%20Mg—8.2Gd—3.8Y—1.0Zn—0.4Zr%20(wt.%)%20合金%20含%20LPSO%20相%20和%20γ%20—析出物
影响因子：
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作者：
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影响因子：
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作者：
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