Effect of Cryogenic Treatment Prior to Rolling on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy. Issue 10 (October 2018)

• Record Type: Journal Article
• Authors: Zhiquan, Huang; Jianchun, Wei; Qingxue, Huang; Lifeng, Ma; Xiangyu, Gao; Zhaohan, Yue
• Is Part Of: Xi you jin shu cai liao yu gong cheng. Volume 47:Issue 10(2018)
• Page Start: 2942
• Page End: 2948
• Publication Date: 2018-10
• Subjects: AZ31 magnesium alloy -- cryogenic treatment -- second phase particles -- fracture morphology; Nonferrous metals -- Periodicals; 669.05
• DOI: 10.1016/S1875-5372(18)30215-7
• Languages: English
• ISSNs: 1875-5372

Abstract

Abstract: The effects of cryogenic treatment prior to hot rolling on the strength, toughness and ductility of as-cast AZ31 magnesium alloy plates were investigated. The cryogenic treatment conditions were −60 °C/12 h, −120 °C/12 h, −180 °C/12 h, −60 °C/2 h, and −180 °C/2 h. Experimental results show that appropriate cryogenic treatment conditions can significantly refine the grain size and the improve strength, toughness and ductility. A large number of twins appear in both kinds of samples cryogenically treated for 2 h. The sample experienced cryogenic treatment for 12 h at −60 °C followed by rolling process shows the finest and most uniform and increase in yield strength by 25.8%. Meanwhile, a four-time increase in extension rate (3.06% to 12.31%) is attains. The tensile fracture present a mixed-mode fracture, which is characteristic of brittle and ductile fracture mechanisms.