Tailoring AZ91 laminates for combination of strength and ductility

Three types of laminates were designed by alternately stacking AZ91 extruded sheets in different states for extrusion to improve the mechanical properties. The tensile tests revealed that the combination of solid-solution-treated sheets with the aging-treated sheets achieved high tensile strength an...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2021-12, Vol.31 (12), p.3703-3718
Main Authors: CHEN, Xiang, WANG, Wei-zhang, ZHANG, Jun-lei, HUANG, Guang-sheng, LIU, Shuai-shuai, TANG, Ai-tao, JIANG, Bin, PAN, Fu-sheng
Format: Article
Language:English
Subjects:
aging
AZ91 Mg alloy
extrusion
mechanical properties
solid solution treatment
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Summary:Three types of laminates were designed by alternately stacking AZ91 extruded sheets in different states for extrusion to improve the mechanical properties. The tensile tests revealed that the combination of solid-solution-treated sheets with the aging-treated sheets achieved high tensile strength and ductility, i.e., ultimate tensile strength of ~386 MPa and elongation of ~19.8%, respectively. Electron backscatter diffraction (EBSD) and TEM results indicated that the aging-treated layers with more nano-sized precipitates and small grain size provided high strength and reasonable ductility, while the solid-solution-treated layers with low dislocation density facilitated strain hardening. Also, the strong interface bonding between the successive layers played an important role in the enhanced ductility.
ISSN:1003-6326
DOI:10.1016/S1003-6326(21)65758-8