期刊
MATERIALS & DESIGN
卷 87, 期 -, 页码 891-900出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.08.052
关键词
Magnesium alloy; Forging; Twinning; Dynamic reaystallization; Texture; Mechanical properties
资金
- National Basic Research Program of China (973 Program) [2013CB632202]
- National Natural Science Foundation of China (NSFC) [51301173]
Multi-directional impact forging (MDIF) and subsequent heat treatment were applied to an as-cast AZ61 Mg alloy and the microstructure, texture evolution and mechanical properties were systematically investigated. The microstructural evolution during MDIF was classified into twinning-active and dynamic recrystallization (DRX)-predominant stages. During the early forging passes, a complicated twinning behavior was observed, including {10-12} primary, {10-12}-{10-12} secondary and {10-12}-{10-12}-{10-12} ternary twins with various twin variants, and even detwinning behavior. With further continuous forging, {10-12} twins disappeared leading to the formation of coarse DRXed grains, and fine DRXed grains began to nucleate at serrated grain boundaries of the coarse DRXed grains due to discontinuous DRX mechanism and progressively consumed the coarse DRXed grains, eventually resulting in a bimodal microstructure. Meanwhile, as-cast random texture turned into a special non-basal texture. After subsequent heat treatment at 400 degrees C for 2 h, the coarse eutectic network completely disappeared with fine beta-Mg17AlI2 particles uniformly locating at grain boundaries and the non-basal texture stayed stable, thereby resulting in a good balance of strength (ultimate tensile strength of 259 MPa) and ductility (20.6%). (C) 2015 Elsevier Ltd. All rights reserved.
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