聂凯波,杨安,邓坤坤,康心锴,李亚楠.挤压参数对SiC颗粒增强Mg-3.6Zn-0.6Y-0.2Ca基复合材料组织和力学性能的影响[J].稀有金属材料与工程,2021,50(4):1187~1195.[Nie Kaibo,Yang An,Deng Kunkun,Kang Xinkai,Li Yanan.Effect of extrusion parameters on microstructure and mechanical properties of a SiC particles reinforced Mg-3.6Zn-0.6Y-0.2Ca matrix composite[J].Rare Metal Materials and Engineering,2021,50(4):1187~1195.]
挤压参数对SiC颗粒增强Mg-3.6Zn-0.6Y-0.2Ca基复合材料组织和力学性能的影响
投稿时间:2020-04-17  修订日期:2020-06-04
中文关键词:  SiC[sub_s]p[sub_e]/Mg-Zn-Y-Ca复合材料  热挤压  微结构  力学性能
基金项目:国家自然科学基金(51771129, 51401144 and 51771128)
中文摘要:
      对挤压前后SiC颗粒增强Mg-3.6Zn-0.6Y-0.2Ca基复合材料组织和力学性能的研究表明:随挤压速率或挤压温度的增加,再结晶晶粒的尺寸增加,体积分数则略有增加。随挤压速率的增加,动态析出相的尺寸增加,体积分数减小。当挤压温度设定为230℃时随挤压速率由0.01 mm/s增加到0.1 mm/s,或当挤压速率设定为0.1 mm/s时挤压温度由190 ℃增加到230 ℃,复合材料的屈服强度和抗拉强度降低,而伸长率则逐渐增加。在优化的挤压参数(190 ℃,0.1 mm/s)下挤压态复合材料的屈服强度、抗拉强度和伸长率分别为312.0 MPa,347.3 MPa和6.6%;其中晶粒细化对强度提升的贡献高于热错配强化与析出强化。
Effect of extrusion parameters on microstructure and mechanical properties of a SiC particles reinforced Mg-3.6Zn-0.6Y-0.2Ca matrix composite
英文关键词:SiCp/Mg-Zn-Y-Ca composite  hot extrusion  microstructure  mechanical properties
英文摘要:
      The microstructures and mechanical properties of a newly developed Mg-3.6Zn-0.6Y-0.2Ca matrix composite containing SiC particle before and after extrusion were investigated. The grain sizes of the as-extruded composites were significantly decreased as compared to the as-homogenized composite before extrusion. With increasing the extrusion speed or extrusion temperature, the size of recrystallized grains increased while the volume fraction slightly increased. The size of dynamic precipitated phases increased and the volume fraction decreased with increasing the extrusion speed. With an increase in extrusion speed from 0.01 mm/s to 0.1 mm/s at 230 °C or extrusion temperature from 190 °C to 230 °C at 0.1 mm/s, the yield strength and ultimate tensile strength decreased while the elongation increased. The yield strength, ultimate tensile strength and elongation of composite extruded at optimized extrusion parameters (at 190 °C at 0.1 mm/s) were 312.0 MPa, 347.3 MPa and 6.6%, respectively. The contribution of grain refinement strengthening on the strength increment was higher relative to the thermal expansion effect and precipitates strengthening.
作者单位E-mail
聂凯波 太原理工大学 材料科学与工程学院,山西 太原 niekaibo2015@163.com 
杨安 太原理工大学 材料科学与工程学院,山西 太原  
邓坤坤 太原理工大学 材料科学与工程学院,山西 太原  
康心锴 太原理工大学 材料科学与工程学院,山西 太原  
李亚楠 太原理工大学 材料科学与工程学院,山西 太原  
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