期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 32, 期 12, 页码 5391-5400出版社
SPRINGER
DOI: 10.1007/s11665-022-07510-z
关键词
dynamic recrystallization; mechanical properties; Mg-Zn-Al-Ca alloy; microstructure; texture
In this study, a Mg-Zn-Al-Ca alloy was processed using forward extrusion and post ECAP method. The evolution of microstructure and mechanical properties of the alloy was systematically investigated. The results showed that the decreased-temperature ECAP processing led to significant grain refinement and the production of substructures in the alloy. The alloy achieved a minimum average grain size of 1.04 μm after specific passes of ECAP at certain temperatures. Furthermore, the texture type of the alloy changed after ECAP deformation. The Mg-5Zn-2Al-1Ca alloy exhibited excellent mechanical properties after the last passes of ECAP, with strength increase contributed by grain boundary strengthening, texture strengthening, and Orowan strengthening effect.
In this work, a Mg-Zn-Al-Ca alloy was processed by the combination of forward extrusion and post ECAP. The evolution and corresponding mechanism of the microstructure and mechanical properties of the Mg-5Zn-2Al-1Ca alloy were systematically investigated. As a result, the decreased-temperature ECAP processing contributes to the significant grain refinement and the production of substructures in the alloy. The minimum average grain size of 1.04 mu m is achieved in the alloy after 2 passes of ECAP at 250 degrees C, followed by 2 passes of ECAP at 170 degrees C. Moreover, the texture type is changed from conventional basal fiber texture to shear texture after ECAP deformation. Consequently, the Mg-5Zn-2Al-1Ca alloy after the last 2 passes of ECAP at 170 degrees C exhibits excellent mechanical properties (ultimate tensile strength of similar to 350 MPa and an elongation of similar to 20%). The grain boundary strengthening and the texture strengthening as well as the Orowan strengthening effect are considered as the main contributors to the substantial increase in strength.
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