Microstructures and mechanical properties of AZ91 alloys prepared by multi-pass friction stir processing

作者：Chai, Fang; Yan, Fei; Wang, Wei^*; Lu, Qichen; Fang, Xiang

来源：Journal of Materials Research, 2018, 33(12): 1789-1796.

DOI：10.1557/jmr.2018.98

• HIGH-PRESSURE TORSION
• MAGNESIUM ALLOY
• ALUMINUM-ALLOY
• EXTRUSION
• BEHAVIOR
• TENSILE
• COMPOSITES
• STRENGTH

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 beta-Mg17Al12 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.

• 出版日期2018-6-28
• 单位武汉理工大学