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- Title
Thermal Fatigue Behavior and Microstructure Evaluation of Mg Alloys After Precipitation Hardening.
- Authors
Qiao, Xun; Pan, Biao; Liu, Shoufa; Dang, Bo; Liu, Yiyang
- Abstract
The behavior of AZ91 and ZK60 Mg alloys thermal cycles before and after precipitation hardening were investigated. For this purpose, AZ91 and ZK60 Mg alloys were cast and aged. Thermal cycle tests were performed on notched samples under 100–500 heating/cooling cycles at 150°C, 350°C and 450°C. The crack lengths (CLs) were examined via microstructural investigations, and THE porosity, thermal expansion coefficient (CTE), and microhardness were measured for the characterized samples. The results showed that the as-cast/aged AZ91 alloy's porosity increased as the heat cycles were increased to 500. Furthermore, it was determined that the CLs were not linearly increased versus cycle number, and, in general, a period of strong crack growth was accompanied by a period of slow crack growth. After 500 cycles, the CLs of aged alloys compared to the as-cast alloys have decreased by 60% at 350°C. At 150°C, for the aged alloys, precipitate-induced twinning was the dominant crack resistance mechanism. The distribution of the precipitates near the grain boundaries was the main crack growth resistance mechanism induced by the crack deflection by precipitates in the aged ZK60 alloys at 350°C. Crack deflection by the precipitates and clustering of the precipitates were the main crack resistance mechanisms in the aged AZ91 alloys.
- Subjects
THERMAL fatigue; BEHAVIORAL assessment; ALLOYS; FRACTURE mechanics; THERMODYNAMIC cycles; PRECIPITATION hardening
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5819
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06189-4