连续柱状晶组织CuNi10Fe1Mn合金变形行为的各向异性

发布时间：2018-03-18 15:01

本文选题：连续柱状晶　切入点：Cu-Ni合金　出处：《金属学报》2015年01期 　论文类型：期刊论文

【摘要】：研究了连续柱状晶组织Cu Ni10Fe1Mn合金板试样沿平行柱状晶生长方向(SD)和垂直柱状晶生长方向(PD)拉伸时的力学性能和变形行为,讨论了连续柱状晶组织各向异性对合金力学性能和变形行为的影响.研究结果表明:试样沿SD和PD均具有[100]择优取向,但沿SD所有晶粒的取向均分布于[100]附近,平均Taylor因子m值约为2.17,而沿PD部分晶粒的取向分散于[001]-[011]之间,具有一定的取向分散性,m值约为2.93.低取向分散性、无横向晶界约束等组织特征使试样沿SD变形时应力分布均匀,各晶粒沿拉伸方向变形一致,屈服强度和抗拉强度分别为85和215 MPa,断后伸长率达到42%,具有典型韧性断口;由于存在一定的取向分散性和横向晶界,使得PD试样变形时出现明显的晶界应力集中和表面凹凸起伏,屈服强度明显增加,为115 MPa,断后伸长率下降至36%,具有混合型断口.连续柱状晶组织Cu Ni10Fe1Mn合金的晶粒取向和晶界分布的各向异性是造成变形行为各向异性的原因.
[Abstract]:The mechanical properties and deformation behavior of continuous columnar microstructure Cu Ni10Fe1Mn alloy sheet specimens during tensile tension along parallel columnar crystal growth direction and vertical columnar crystal growth direction were studied. The effect of anisotropy of continuous columnar crystal on mechanical properties and deformation behavior of the alloy is discussed. The results show that the specimens have [100] preferred orientation along SD and PD, but all the orientation along SD are located near [100]. The average value of Taylor factor m is about 2.17, while the orientation of partial grains along PD is dispersed between [001]-[011], and the value of m is about 2.93. The stress distribution along SD is uniform due to the low orientation dispersion and no transverse grain boundary constraint. The yield strength and tensile strength of each grain are 85 and 215 MPa, respectively, and the elongation after fracture reaches 42. The grain has typical ductile fracture surface, due to the existence of certain orientation dispersion and transverse grain boundary. When PD specimen is deformed, obvious grain boundary stress concentration and surface ups and downs occur, and the yield strength increases obviously. At 115MPa, the elongation of Cu Ni10Fe1Mn alloy decreases to 36 and has a mixed fracture surface. The anisotropy of grain orientation and grain boundary distribution of continuous columnar structure Cu Ni10Fe1Mn alloy is the cause of anisotropy of deformation behavior.
【作者单位】：北京科技大学新材料技术研究院材料先进制备技术教育部重点实验室;北京科技大学现代交通金属材料与加工技术北京实验室;
【基金】：国家科技支撑计划项目2011BAE23B00 国家自然科学基金项目51104015 新金属材料国家重点实验室自主研究课题2012Z-12资助~~
【分类号】：TG146.11

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