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一个共面双滑移取向Cu单晶体疲劳位错结构的热稳定性研究
INVESTIGATIONS ON THERMAL STABILITY OF FATIGUE DISLOCATION STRUCTURES IN A DOUBLE-SLIP-ORIENTED Cu SINGLE CRYSTAL

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郭巍巍 1   齐成军 1   李小武 2 *  
文摘 在不同塑性应变幅下对[233]共面双滑移取向Cu单晶体进行疲劳实验直至循环饱和,然后在不同温度进行退火处理.利用SEM-ECC和TEM观察疲劳位错结构及其退火后微观结构的变化.结果表明,退火温度为300℃时,位错结构均发生了明显的回复,高应变幅下疲劳样品中甚至出现了部分再结晶.在500和800℃退火,所有晶体都发生了严重的再结晶,并且有大量的退火孪晶出现.随着塑性应变幅和累积塑性应变量的增加,应变集中程度明显增加,为再结晶的发生和孪晶的萌生提供了更大的局部应变能,所以再结晶发生得更为显著,退火孪晶变得更为粗大且数量增加.退火挛晶的形成与层错的出现有密切关系.DSC测试分析表明,再结晶的发生不是突发式的,而是一个缓慢的过程.
其他语种文摘 Although comprehensive research findings of the cyclic deformation and dislocation structures of Cu single crystals with various orientations have been well established over the four decades, studies on the thermal stability of dislocation structures in fatigued Cu single crystals are still rarely reported. In the present work, [233] Cu single crystals oriented for coplanar double slip were firstly cyclically deformed at different plastic strain amplitudes γPI up to saturation, and then annealed at different temperatures for 30 min. The dislocation structures induced by cyclic deformation as well as the microstructural changes resulting from subsequent annealing treatments were detected by using the electron channeling contrast (ECC) technique in SEM and TEM. It was found that the dislocation structures have undergone an obvious process of recovery at 300 °C, and the recrystallization even partially takes place in the sample fatigued at high γ_(PI). However, at 500 and 800 °C, the violent recrystallization takes place in all crystals and a large number of annealing twins have appeared. As the plastic strain amplitude and accumulated plastic strain increase, the degree of strain concentration would be significantly aggravated, providing a higher local strain energy for the occurrence of recrystallization and the initiation of twins, so that the recrystallization takes place more noticeably, and annealing twins become coarser and the number of them increases notably. The formation of annealing twins is closely related to the appearance of stacking faults. The DSC measurements demonstrated that the recrystallization process and the formation process of twins should be a gradually-developing process, instead of a suddenly-forming process.
来源 金属学报 ,2013,49(1):107-114 【核心库】
DOI 10.3724/sp.j.1037.2012.00411
关键词 Cu单晶体 ; 疲劳位错结构 ; 热稳定性 ; 再结晶 ; 退火孪晶
地址

1. 东北大学理学院材料物理与化学研究所, 沈阳, 110819  

2. 东北大学理学院材料物理与化学研究所, 材料各向异性与织构教育部重点实验室, 沈阳, 110819

语种 中文
文献类型 研究性论文
ISSN 0412-1961
学科 金属学与金属工艺
基金 国家自然科学基金项目 ;  中央高校基本科研业务费专项资金 ;  国家教育部高等学校博士学科点专项科研基金
文献收藏号 CSCD:4748768

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引证文献 2

1 郭巍巍 粗晶纯铝疲劳位错结构的热稳定性 中国有色金属学报,2014,24(11):2718-2726
被引 1

2 郭巍巍 共轭和临界双滑移取向Cu单晶体疲劳位错结构的热稳定性研究 金属学报,2016,52(6):761-768
被引 0 次

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