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粗晶纯铝疲劳位错结构的热稳定性被引量:1
2014年
在不同总应变幅下对高层错能粗晶纯铝进行疲劳实验直至达到近似相同的累积应变量,然后再在不同温度(200、330和450℃进行退火处理。利用透射电子显微镜观察疲劳位错结构及其退火后微观结构的变化。结果表明:粗晶纯铝疲劳位错结构主要为胞结构,胞尺寸随着外加应变幅的升高逐渐减小,胞壁逐渐变得致密,胞内位错密度下降;粗晶纯铝疲劳处理后在3个温度下进行退火处理,所有样品的疲劳位错结构均发生明显的回复现象;只是在相对较低温度200℃退火时,低应变幅下形成的位错结构的回复机制主要为空位消失和异号位错相消,而中、高应变幅下位错结构的回复机制主要表现为多边形化回复机制。粗晶纯铝经不同总应变幅疲劳后的DSC曲线测量结果与TEM观察结果基本一致。
郭巍巍齐成军颜莹李小武
关键词:纯铝热稳定性退火
Temperature-Dependent Compressive Deformation Behavior of Commercially Pure Iron Processed by ECAP被引量:2
2015年
To explore the temperature dependence of deformation behavior of BCC structural materials and the relevant effect of pre-annealing, commercially pure iron (CP Fe) produced by equal-channel angular pressing (ECAP) is selected as the experimental material. The influences of deformation temperature T and pre-annealing on deformation behavior, surface deformation characteristics and substructures of ECAP Fe were systematically studied. The results show that ECAP Fe undergoes a remarkable strain softening stage after a rapid strain hardening during uniaxial compression, and the softening degree and the yield strength avs first decrease and then increase with raising temperature. Pre-annealing at 400 ℃ effectively weakens the strain softening degree and increases trys. To understand the influence of deformation temperature on deformation behavior, as well as the relevant pre-annealing effect, deformation and damage characteristics and dislocation structures are studied in detail. In a word, the strain softening of ECAP Fe is associated not only with internal structural instability, but also with temperature, and pre-annealing at 400 ℃ improves high-temperature me- chanical properties of ECAP Fe.
Ying YanYue QiQing-Wei JiangXiao-Wu Li
关键词:PRE-ANNEALING
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