Microstructures and mechanical properties of AZ91 alloys prepared by multi-pass friction stir processing. Issue 12 (15th May 2018)

• Record Type: Journal Article
• Authors: Chai, Fang; Yan, Fei; Wang, Wei; Lu, Qichen; Fang, Xiang
• Is Part Of: Journal of materials research. Volume 33:Issue 12(2018)
• Page Start: 1789
• Page End: 1796
• Publication Date: 2018-05-15
• Subjects: multi-pass friction stir processing, -- AZ91 magnesium alloy, -- microstructure, -- mechanical properties; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2018.98
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : AZ91 magnesium plates with a thickness of 6 mm were subjected to one- and two-pass friction stir processing (FSP). Microstructures and mechanical properties of the experimental materials were investigated. The results show that FSP can significantly refine the microstructures of magnesium alloys, and two-pass FSP can prepare slightly finer grains in comparison with one-pass FSP. Some coarse β-Mg17 Al12 phases existed in the first pass FSP break and dissolve into the matrix under the action of the second pass FSP. Microhardness distribution of the two-pass FSP AZ91 alloy exhibits no too much difference with that of the one-pass FSP AZ91 alloy. Due to further finer microstructures, the tensile properties of the two-pass FSP alloy are slightly higher than those of the one-pass FSP alloy. Both FSP AZ91 alloys show typical ductile fracture characteristics, while the dimples on the two-pass FSP specimen are much deeper and increase in quantity.