Effect of Yttrium Addition on Microstructural Characteristics and Superplastic Behavior of Friction Stir Processed ZK60 Alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第12期
论文作者：Z.A.Luo G.M.Xie Z.Y.Ma G.L.Wang G.D.Wang
文章页码：1116 - 1122
摘 要：As-extruded ZK60 and ZK60-Y magnesium alloy plates were successfully processed via friction stir processing（FSP） at a tool rotation rate of 1600 r/min and a traverse speed of 200 mm/min. FSP resulted in the formation of equiaxed recrystallized microstructures with the average grain sizes of w8.5 and w4.7 mm in the ZK60 and ZK60-Y alloys, respectively. Moreover, FSP broke and dispersed the MgZn2 and W-phase（Mg3 Zn3 Y2） particles and dissolved MgZn2 phase in the FSP ZK60 alloy. With the addition of rare earth element yttrium（Y） into the ZK60 alloy, the ratio of the high angle grain boundaries（HAGBs） in the FSP alloys increased from 64% to 90%, and a certain amount of twins appeared in the FSP ZK60-Y alloy. The maximum elongation of 1200% and optimum strain rate of 3 103s1achieved at 450 C in the FSP ZK60-Y alloy were substantially higher than those of the FSP ZK60 alloy. This is attributed to the fine grains with high ratio of HAGBs and the distribution of a large number of dispersed second phase particles with high thermal stability in the FSP ZK60-Y alloy. Grain boundary sliding was identified as the primary deformation mechanism in the FSP ZK60 and ZK60-Y alloys from the superplastic data analyses and surficial morphology observations.
Z.A.Luo1，G.M.Xie1，Z.Y.Ma2，G.L.Wang1，G.D.Wang1
1. State Key Laboratory of Rolling and Automation,Northeastern University2. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences
摘 要：As-extruded ZK60 and ZK60-Y magnesium alloy plates were successfully processed via friction stir processing（FSP） at a tool rotation rate of 1600 r/min and a traverse speed of 200 mm/min. FSP resulted in the formation of equiaxed recrystallized microstructures with the average grain sizes of w8.5 and w4.7 mm in the ZK60 and ZK60-Y alloys, respectively. Moreover, FSP broke and dispersed the MgZn2 and W-phase（Mg3 Zn3 Y2） particles and dissolved MgZn2 phase in the FSP ZK60 alloy. With the addition of rare earth element yttrium（Y） into the ZK60 alloy, the ratio of the high angle grain boundaries（HAGBs） in the FSP alloys increased from 64% to 90%, and a certain amount of twins appeared in the FSP ZK60-Y alloy. The maximum elongation of 1200% and optimum strain rate of 3 103s1achieved at 450 C in the FSP ZK60-Y alloy were substantially higher than those of the FSP ZK60 alloy. This is attributed to the fine grains with high ratio of HAGBs and the distribution of a large number of dispersed second phase particles with high thermal stability in the FSP ZK60-Y alloy. Grain boundary sliding was identified as the primary deformation mechanism in the FSP ZK60 and ZK60-Y alloys from the superplastic data analyses and surficial morphology observations.
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