Ni单晶体塑性应变的非均匀性与加工硬化<sup>*</sup>

doi:10.11900/0412.1961.2015.00085

金属学报

2015, Vol. 51

Issue (12): 1457-1464 DOI: 10.11900/0412.1961.2015.00085

本期目录 | 过刊浏览

Ni单晶体塑性应变的非均匀性与加工硬化^*

王晓钢(

),姜潮,韩旭

湖南大学汽车车身先进设计制造国家重点实验室, 长沙 410082

PLASTIC STRAIN HETEROGENEITY AND WORK HARDENING OF Ni SINGLE CRYSTALS

Xiaogang WANG(

),Chao JIANG,Xu HAN

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University,Changsha 410082

引用本文:

王晓钢,姜潮,韩旭. Ni单晶体塑性应变的非均匀性与加工硬化^*[J]. 金属学报, 2015, 51(12): 1457-1464.
Xiaogang WANG, Chao JIANG, Xu HAN. PLASTIC STRAIN HETEROGENEITY AND WORK HARDENING OF Ni SINGLE CRYSTALS[J]. Acta Metall Sin, 2015, 51(12): 1457-1464.

全文: PDF(1017 KB) HTML

摘要:

通过数字图像相关方法获取全场应变信息, 从应变非均匀性的角度研究Ni单晶体的加工硬化行为. 首先提出一种适用于描述单晶体变形的数字图像相关方法, 用于准确获取应变场. 拉伸实验结果表明, Ni单晶体的塑性应变具有显著的局部化特征, 这与滑移带的形成、发展密切相关. 根据应变场的演化特征, 3种变形机制可被确定, 且发现它们与材料的3个加工硬化阶段具有一一对应关系. 在位错理论框架下, 两者之间的内在联系得到了合理的解释, 并通过对材料微观结构演化的实验观测得到了很好的验证.

关键词 ： Ni单晶体, 加工硬化, 塑性变形, 数字图像相关, 非均匀性

Abstract：

Metals exhibit inhomogeneous deformation features under plastic strain, leading to the appearance and evolution of the deformation bands. The quantitative characterization of this effect is significant for an in-depth understanding of the plastic deformation and strengthening mechanisms of metals. In this work, the full-field strain information are obtained using digital image correlation method, and the work hardening behaviour in Ni single crystals is investigated from the angle of strain heterogeneity. First, a digital image correlation method, adapted for characterizing single crystal deformation, is proposed for the precise evaluation of strain field. The tensile test results show that the plastic strain in Ni single crystal manifests a distinct localization characteristic, which is closely linked to the slip band formation and development process. Based on the characteristics of the strain field evolution, 3 deformation regimes can be determined, which demonstrate a one-to-one correspondence to the 3 work hardening stages of the material. Some reasonable interpretations of their correlation are proposed within the framework of dislocation theories, which are verified through the experimental observations on the microstructure evolution of the material.

Key words： Ni single crystal work hardening plastic deformation digital image correlation heterogeneity

基金资助:* 国家自然科学基金项目11172096 和教育部高等学校全国优博论文作者专项基金项目201235 资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00085 或 https://www.ams.org.cn/CN/Y2015/V51/I12/1457

图1 试样的几何尺寸示意图

图2 变形后的试样表面形貌

图3 最终变形状态下的轴向与横向位移场

图4 轴向应力-应变曲线及标记点处的von Mises等效应变场

图5 变形机制I, Ⅱ和ⅡI对应的典型von Mises等效应变(eeq)场

图6 变形机制I, Ⅱ和ⅡI下εeq在不同单元内的分布

图7 敏感指标sB在拉伸实验中的演化及3种变形机制的确定

图8 t-g和q-g曲线及加工硬化阶段

图9 不同应变水平下的位错密度(rw, rc, rt)

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