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Effect of Gd content on microstructure and dynamic mechanical properties of solution-treated Mg−xGd−3Y−0.5Zr alloy 被引量:9

Gd含量对固溶处理Mg-xGd-3Y-0.5Zr合金组织与动态力学性能的影响
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摘要 The effect of Gd content ranging from 6.5 wt.%to 8.5 wt.%on microstructure evolution and dynamic mechanical behavior of Mg−xGd−3Y−0.5Zr alloys was investigated by optical microscopy,X-ray diffraction,scanning electron microscopy and split Hopkinson pressure bar.The microstructure of as-cast Mg−xGd−3Y−0.5Zr alloys indicates that the addition of Gd can promote grain refinement in the casting.Due to the rapid cooling rate during solidification,a large amount of non-equilibrium eutectic phase Mg_(24)(Gd,Y)_(5) appears at the grain boundary of as-cast Mg−xGd−3Y−0.5Zr alloys.After solution treatment at 520℃ for 6 h,the Mg_(24)(Gd,Y)_(5) phase dissolves into the matrix,and the rare earth hydrides(REH)phase appears.The stress−strain curves validate that the solution-treated Mg−xGd−3Y−0.5Zr alloys with optimal Gd contents maintain excellent dynamic properties at different strain rates.It was concluded that the variation of Gd content and the agglomeration of residual REH particles and dynamically precipitated fine particles are key factors affecting dynamic mechanical properties of Mg−xGd−3Y−0.5Zr alloys. 采用金相显微镜、X射线衍射、扫描电子显微镜、分离式霍普金森压杆等手段,研究Gd含量(6.5%~8.5%,质量分数)对Mg-xGd-3Y-0.5Zr合金显微组织与动力学行为的影响。观察铸态Mg-xGd-3Y-0.5Zr合金显微组织可知,Gd的加入可促进晶粒细化。由于合金凝固时冷却速度快,在晶界处出现大量非平衡共晶相Mg_(24)(Gd,Y)_(5)。经过520℃固溶处理6h后,非平衡共晶相Mg_(24)(Gd,Y)_(5)融入基体中并产生稀土氢化物相(REH)。根据应力-应变曲线可知,不同Gd含量的固溶态Mg-xGd-3Y-0.5Zr合金在不同应变速率下均表现出优异的抗冲击性能。结果表明,Gd含量的变化、稀土氢化物粒子的聚集以及细小的动态析出相是影响Mg-xGd-3Y-0.5 Zr合金动态力学性能的关键因素。
作者 Xue-zhao WANG You-qiang WANG Chen-bing NI Yu-xin FANG Xiao YU Ping ZHANG 王雪兆;王优强;倪陈兵;房玉鑫;于晓;张平(青岛理工大学机械与汽车工程学院,青岛266520;工业流体节能与污染控制教育部重点实验室,青岛266520;山东科技大学机械电子工程学院,青岛266590)
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第7期2177-2189,共13页 中国有色金属学报(英文版)
基金 supported by the National Natural Science Foundation of China (Nos.51575289,51705270) the Key Research and Development Project of Shandong Province,China (No.2019GHY112068) the Natural Science Foundation of Shandong Province,China (No.ZR2019PEE028)。
关键词 Mg−xGd−3Y−0.5Zr alloy MICROSTRUCTURE dynamic mechanical properties rare earth hydrides dynamic precipitated phase Mg-xGd-3Y-0.5Zr合金 显微组织 动态力学性能 稀土氢化物 动态析出相
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