Tensile behavior at various temperatures of the Mg-Gd-Y-Zn-Zr alloys with different initial morphologies of LPSO phases prior to extrusion
Tensile behavior at various temperatures of the Mg-Gd-Y-Zn-Zr alloys with different initial morphologies of LPSO phases prior to extrusion
复制标题
具有不同 LPSO 相初始形貌的 Mg-Gd-Y-Zn-Zr 合金在挤压前不同温度下的拉伸行为
DOI：
10.1016/j.msea.2022.143634
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Y.R. Liu
中科院分区：
文献类型：
--
作者：
X.D. Yang;X.J. Zhou;S.L. Yu;J. Zhang;X.Z. Lu;X.M. Chen;L.W. Lu;W.Y. Huang;Y.R. Liu
摘要：研究了Mg-5Gd-3Y-xZn-0.5 Zr （x= 1 wt%和2 wt%，分别为VWZ531K和VWZ532K）挤压峰时效合金在(−100)-300℃的拉伸行为，包括组织演变、变形模式、力学性能等。较高的Zn含量使VWZ532K合金在初始均质状态下具有较多的晶内片层状LPSO相和较大的枝晶间LPSO相，从而导致DRX比降低，DRXed晶粒尺寸细化，时效硬化响应可以忽略。挤压过程中，VWZ531K合金中析出晶内LPSO相，部分DRXed晶粒形成与挤压方向平行的特殊织构成分。而VWZ532K合金则经历了晶内LPSO的溶解和β相的动态析出。在拉伸试验中，变形模式（包括孪晶、基底滑移和非基底滑移）受测试温度、晶粒取向、LPSO形貌等因素的影响。与β′相相相比，LPSO相具有较高的热稳定性，可保持高温强度，从而使VWZ532K合金在300℃时获得较高的抗拉屈服强度（182 MPa），而在- 100℃时，LPSO相的较大体积分数导致VWZ532K合金具有异常的高伸长率（17.9%）。
Abstract The tensile behavior at (− 100)-300° C of the extruded and peak-aged Mg-5Gd-3Y-xZn-0.5 Zr (x= 1 and 2 wt%, designated as VWZ531K and VWZ532K) alloys was investigated in the aspects of microstructural evolution, deformation modes, mechanical properties, etc. The higher Zn content endows the VWZ532K alloy with more intragranular lamellar LPSO phases and larger interdendritic ones at the initial homogenized status, which induces the lower DRX ratio, finer DRXed grain size, and negligible aging hardening response subsequently. During extrusion, precipitation of intragranular LPSO phases occurred in the VWZ531K alloy and partial DRXed grains formed a special texture component with the c-axis aligning parallel to the extrusion direction. However, the VWZ532K alloy experienced the dissolution of intragranular LPSO and dynamic precipitation of β phases. During tensile tests, deformation modes (including twinning, basal slip and non-basal slip) were modified by the testing temperature, grain orientation, LPSO morphology, etc. Compared with the β′ precipitates, LPSO phases are more thermostable to maintain the high-temperature strength, which induce the higher tensile yield strength of the peak-aged VWZ532K alloy (182 MPa) at 300° C. The larger volume fraction of tension twins and lamellar LPSO phases result in the abnormal high elongation (17.9%) at− 100° C for the VWZ531K alloy.
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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：
4.6
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
8.4
作者：
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通讯作者：
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