郭廷彪,王晨,李琦,张锋,贾智.单晶铜ECAP/Bc路径形变结构与力学性能[J].稀有金属材料与工程,2018,47(10):3096~3103.[guotingbiao,wangchen,liqi,zhangfeng,jiazhi.Deformation Structure and Mechanical Properties of Single Crystal Copper Deformed by Route Bc ECAP[J].Rare Metal Materials and Engineering,2018,47(10):3096~3103.]
单晶铜ECAP/Bc路径形变结构与力学性能
投稿时间:2016-12-29  修订日期:2017-05-04
中文关键词:  等通道转角挤压  电子背散射衍射  织构  单晶铜
基金项目:国家自然科学基金资助(项目号51261016)
中文摘要:
      采用电子背散射衍射技术(EBSD)、XRD,研究了单晶铜在等通道转角挤压(ECAP)/Bc路径4道次变形过程中形变结构演变,并检测了变形材料的力学性能。结果表明:低道次变形不改变单晶铜的宏观取向;2道次变形后,材料微观组织中出现取向一致的剪切带,与ED轴成15°-20°角,晶粒内部出现了形变织构{111}<112>;经过4道次变形后,剪切带与ED轴夹角不变但倾斜方向与2道次相反,形变织构不发生改变,且未出现大角度晶界;抗拉强度由168MPa提高至395MPa,延伸率则从63%降至26.5%,硬度由60Hv提高到125Hv,之后趋于平缓;由于位错堆积,材料塑性变差,断口颈缩面积变大。ECAP可使单晶铜在未破碎的情况下得到强化。
Deformation Structure and Mechanical Properties of Single Crystal Copper Deformed by Route Bc ECAP
英文关键词:equal channel angular pressing  electron backscattered diffraction  texture  single crystal copper
英文摘要:
      The deformation structure of single crystal copper during 4 passes equal channel angular pressing (ECAP) througth route Bc were investigated by electron backscatter diffraction (EBSD) and XRD methods, and the mechanical properties of the deformed material were measured. The results show that the macroscopic orientation of single crystal under low pass deformation was not changed. After 2 passes,orientation-ordered shear bands appeared and inclined at angles in the range of 15°–20°from the ED direction,deformation texture {111}<112> appeared on grains;After 4 passes,the angle between the shear band and the ED direction was constant , the inclined direction was opposite to that of the 2 passes,the texture of the material was still in texture of {111}<112>,and large angle grain boundary was not presented;The tensile strength increased from 168MPa to 395MPa, the elongation decreased from 63% to 26.5%, the material hardness increased from 60Hv to 125Hv and then was tended to be changed little. Because of dislocation accumulation, the plastic deformation capability of the material becomes worse and the necking area increases. ECAP has positive effect on enhanceing the strength of single crystal copper with not broken grains.
作者单位E-mail
郭廷彪 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室 gtb777@163.com 
王晨 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室 601268700@qq.com 
李琦 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
张锋 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
贾智 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
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