采用SEM-SE及定量金相分析技术研究了不同成品退火温度(450~550℃,2 h)的两种Zr-Sn-Nb-Fe合金包壳管第二相颗粒的粗化行为。结果表明,升高温度能促进第二相分布均匀化及尺寸粗化的过程。根据粗化二次动力学方程计算得出Zr-0.3Sn-1.2Nb-0...采用SEM-SE及定量金相分析技术研究了不同成品退火温度(450~550℃,2 h)的两种Zr-Sn-Nb-Fe合金包壳管第二相颗粒的粗化行为。结果表明,升高温度能促进第二相分布均匀化及尺寸粗化的过程。根据粗化二次动力学方程计算得出Zr-0.3Sn-1.2Nb-0.2Fe合金的第二相颗粒粗化激活能为209 k J/mol,Zr-0.5Sn-0.2Nb-0.8Fe合金的第二相颗粒粗化激活能为179 k J/mol。粗化激活能的大小与锆合金中Nb含量的高低存在对应关系。展开更多
In this study,the Mg-3Zn-0.5Zr-χNd(χ=0,0.6)alloys were subjected to final rolling treatment with large deformation of 50%.The impact of annealing temperatures on the microstructure and mechanical properties was inve...In this study,the Mg-3Zn-0.5Zr-χNd(χ=0,0.6)alloys were subjected to final rolling treatment with large deformation of 50%.The impact of annealing temperatures on the microstructure and mechanical properties was investigated.The rolled Mg-3Zn-0.5Zr-0.6Nd alloy exhibited an ultimate tensile strength of 386 MPa,a yield strength of 361 MPa,and an elongation of 7.1%.Annealing at different temperatures resulted in reduced strength and obviously increased elongation for both alloys.Optimal mechanical properties for the Mg-3Zn-0.5Zr-0.6Nd alloy were achieved after annealing at 200℃,with an ultimate tensile strength of 287 MPa,a yield strength of 235 MPa,and an elongation of 26.1%.The numerous deformed microstructures,twins,and precipitated phases in the rolled alloy could impede the deformation at room temperature and increase the work hardening rate.After annealing,a decrease in the work hardening effect and an increase in the dynamic recovery effect were obtained due to the formation of fine equiaxed grains,and the increased volume fraction of precipitated phases,which significantly improved the elongation of the alloy.Additionally,the addition of Nd element could enhance the annealing recrystallization rate,reduce the Schmid factor difference between basal and prismatic slip systems,facilitate multi-system slip initiation and improve the alloy plasticity.展开更多
文摘采用SEM-SE及定量金相分析技术研究了不同成品退火温度(450~550℃,2 h)的两种Zr-Sn-Nb-Fe合金包壳管第二相颗粒的粗化行为。结果表明,升高温度能促进第二相分布均匀化及尺寸粗化的过程。根据粗化二次动力学方程计算得出Zr-0.3Sn-1.2Nb-0.2Fe合金的第二相颗粒粗化激活能为209 k J/mol,Zr-0.5Sn-0.2Nb-0.8Fe合金的第二相颗粒粗化激活能为179 k J/mol。粗化激活能的大小与锆合金中Nb含量的高低存在对应关系。
基金Project(202203021221088)supported by the Fundamental Research Program of Shanxi Province,ChinaProject(20230010)supported by the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province,China+5 种基金Project(202201050201012)supported by the Shanxi Provincial Science and Technology Major Special Project Plan of Taking the Lead in Unveiling the List,ChinaProject(2023-063)supported by the Research Project Supported by Shanxi Scholarship Council of ChinaProjects(51771129,52271109)supported by the National Natural Science Foundation of ChinaProject(2021YFB3703300)supported by the National Key Research and Development Program for Young Scientists,ChinaProject(YDZJSX2021B019)supported by the Special Fund Project for Guiding Local Science and Technology Development by the Central Government,ChinaProject(SKL-YSJ202103)supported by the Open Foundation of State Key Laboratory of High-end Compressor and System Technology,China。
文摘In this study,the Mg-3Zn-0.5Zr-χNd(χ=0,0.6)alloys were subjected to final rolling treatment with large deformation of 50%.The impact of annealing temperatures on the microstructure and mechanical properties was investigated.The rolled Mg-3Zn-0.5Zr-0.6Nd alloy exhibited an ultimate tensile strength of 386 MPa,a yield strength of 361 MPa,and an elongation of 7.1%.Annealing at different temperatures resulted in reduced strength and obviously increased elongation for both alloys.Optimal mechanical properties for the Mg-3Zn-0.5Zr-0.6Nd alloy were achieved after annealing at 200℃,with an ultimate tensile strength of 287 MPa,a yield strength of 235 MPa,and an elongation of 26.1%.The numerous deformed microstructures,twins,and precipitated phases in the rolled alloy could impede the deformation at room temperature and increase the work hardening rate.After annealing,a decrease in the work hardening effect and an increase in the dynamic recovery effect were obtained due to the formation of fine equiaxed grains,and the increased volume fraction of precipitated phases,which significantly improved the elongation of the alloy.Additionally,the addition of Nd element could enhance the annealing recrystallization rate,reduce the Schmid factor difference between basal and prismatic slip systems,facilitate multi-system slip initiation and improve the alloy plasticity.
