钆含量对电弧增材制造成形Mg-Gd合金显微组织和力学性能的影响
Effect of Gd Addition Amount on Microstructure and Mechanical Properties of Mg-Gd Alloy Fabricated by Wire Arc Addictive Manufacturing
摘 要
采用钨极惰性气体保护焊(TIG)电弧增材制造技术制备钆质量分数分别为2%,3%,10%的Mg-Gd合金,研究了钆含量对Mg-Gd合金显微组织和力学性能的影响。结果表明:不同钆含量Mg-Gd合金的显微组织均由镁基体和第二相Mg5Gd组成。随着钆含量的增加,沿晶界分布的第二相Mg5Gd的数量和尺寸增加,形状由圆形颗粒状向长条状转变,合金中气孔数量及尺寸降低,镁晶粒从柱状晶向等轴晶转变,且晶粒尺寸先减小后增大,当钆质量分数为3%时达到最小。随着钆含量的增加,合金的强度增大,断后伸长率下降,断裂方式均为韧性断裂。
显微组织
力学性能
镁合金
钆
wire arc addictive manufacturing
microstructure
mechanical property
magnesium alloy
gadolinium
Abstract
Mg-Gd alloys with Gd mass fraction of 2%,3%,10% were prepared by tungsten inert gas (TIG) arc additive manufacturing technique. The effect of Gd content on the microstructure and mechanical properties of Mg-Gd alloys was studied. The results show that the microstructure of Mg-Gd alloys with different Gd content were all mainly composed of magnesium matrix and the second phase Mg5Gd. With the increase of Gd content, the number and size of the second phase Mg5Gd distributed along the grain boundary increased, the shape changed from round particles to long strips; the Mg grains changed from columnar grains to equiaxed grains. The number and size of pores in the alloy decreased, and the grain size decreased first and then increased, reaching the minimum with 3% Gd. With the increase of gadolinium content, the strength of the alloy increased and the elongation after fracture decreased. The fracture methods were all ductile fracture.
中图分类号 TG444 DOI 10.11973/jxgccl202212005
所属栏目 试验研究
基金项目 上海市Ⅲ类高峰学科-材料科学与工程(高能束智能加工与绿色制造)项目
收稿日期 2021/10/14
修改稿日期 2022/9/25
网络出版日期
作者单位点击查看
备注张新琦(1998-),男,江苏扬州人,硕士研究生
引用该论文: ZHANG Xinqi,YANG Dongye,TIAN Wenqi,SI Ke,LI Jiuxiao,ZOU Wenbin. Effect of Gd Addition Amount on Microstructure and Mechanical Properties of Mg-Gd Alloy Fabricated by Wire Arc Addictive Manufacturing[J]. Materials for mechancial engineering, 2022, 46(12): 30～35
张新琦,杨冬野,田文琦,司珂,李九霄,邹文兵. 钆含量对电弧增材制造成形Mg-Gd合金显微组织和力学性能的影响[J]. 机械工程材料, 2022, 46(12): 30～35
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