Microstructure and Plastic Instability of Mg-4.3Li-1.08Y-5.83Zn Alloy

doi:10.3969/j.issn.1000-1093.2017.03.016

Abstract

Abstract: Mg-4.3Li-1.08Y-5.83Zn deforming alloy is prepared using conventional casting and hot extrusion processing. The microstructure, deformation behavior and mechanical properties of the alloy are investigated by optical microscope, scanning electron microscope, energy density spectrum and X-ray diffraction analyses, and tensile tests. The results show that the quasi-crystalline phase I-Mg₃YZn₆, and the secondary phase W-Mg₃Y₂Zn₃ and Mg_0.97Zn_0.03 are generated in the microstructure of Mg-4.3Li-1.08Y-5.83Zn alloy, thus enhancing the yield strength and ultimate tensile strength significantly. The tensile tests at different strain rates show that the plastic instability occurs in the strain rate range from 1×10^-5 s^-1 to 1×10^-2 s^-1 and the yield and ultimate strengths of the alloy exhibit negative strain rate sensitivity with the increase in strain rate. A reasonable mechanism for this is attributed to the dynamic strain aging (DSA) occurring during tensile deformation. Key

Key words: metallicmaterial, Mg-Li-Y-Znalloy, quasi-crystal, strainrate, plasticinstability

CLC Number:

TG146.22

SHA Gui-ying， YIN Miao， HAN En-hou ， XU Dao-kui， XU Yong-bo， YU Shuang. Microstructure and Plastic Instability of Mg-4.3Li-1.08Y-5.83Zn Alloy[J]. Acta Armamentarii, 2017, 38(3): 534-539.

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第38卷
第3期2017 年3月兵工学报ACTA
ARMAMENTARIIVol.38No.3Mar.2017

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