High strength and high ductility of Mg-10Gd-3Y alloy achieved by a novel extrusion-shearing process
High strength and high ductility of Mg-10Gd-3Y alloy achieved by a novel extrusion-shearing process
复制标题
新型挤压剪切工艺实现Mg-10Gd-3Y合金的高强度和高延展性
DOI：
10.1016/j.jallcom.2022.167498
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发表时间：
2022-10-18
影响因子：
6.2
通讯作者：
Toth, Laszlo S.
中科院分区：
文献类型：
--
作者：
Chen, Cai;Han, Dongsheng;Toth, Laszlo S.
To simultaneously improve the strength and ductility of the Mg-10Gd-3Y alloy, we propose a new pro-cessing route: conventional extrusion (EX), followed by an equal channel angular pressing (ECAP) de-formation, without stopping. The new process is called: extrusion-shearing (ES). By employing ES at 400 degrees C, the tensile yield strength of the Mg-10Gd-3Y alloy was increased to 289 MPa, together with a high ultimate tensile strength of 361 MPa, and a good tensile elongation to failure of 27.4 %, at room temperature. The underlying mechanisms for the simultaneous enhancement in strength and ductility were investigated. The extra shearing deformation by the ECAP-stage of the ES testing led to the formation of a fully recrystallized homogenous microstructure with an average grain size of 4.3 mu m, with dynamic precipitation of Mg5(Gd,Y) particles at/near grain boundaries. Both macro and micro texture characterizations indicated a strong de-crease in the intensity of the crystallographic texture during the ECAP part of the ES process, and a new type of texture. The multicomponent nature of the obtained texture and the microstructural modifications to-gether with a dispersive distribution of precipitates contributed to an excellent combination of high strength and ductility of the Mg-10Gd-3Y alloy processed by ES.(c) 2022 Elsevier B.V. All rights reserved.
