EFFECTS OF SAMPLE DIRECTIONS ON DYNAMIC FORCED SHEAR DEFORMATION BEHAVIORS OF COLD-ROLL Cu SHEET

Acta Metall Sin

2012, Vol. 48

Issue (3): 315-320 DOI:

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EFFECTS OF SAMPLE DIRECTIONS ON DYNAMIC FORCED SHEAR DEFORMATION BEHAVIORS OF COLD-ROLL Cu SHEET

CHEN Zhiyong, TANG Lin, ZHAN Congkun, YANG Xuyue

School of Materials Science and Engineering, Central South University, Changsha 410083

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CHEN Zhiyong TANG Lin ZHAN Congkun YANG Xuyue. EFFECTS OF SAMPLE DIRECTIONS ON DYNAMIC FORCED SHEAR DEFORMATION BEHAVIORS OF COLD-ROLL Cu SHEET. Acta Metall Sin, 2012, 48(3): 315-320.

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Abstract 分别沿与冷轧Cu板轧向成0^o (RD-0^o), 45^o (RD-45^o)和90^o(RD--90^o)方向取帽形试样, 利用Split-Hopkinson压杆实验装置, 研究了强迫剪切条件下冷轧Cu板的动态变形特征. 结果表明: 冷轧Cu板强迫剪切动态力学行为呈现出明显的各向异性, RD--90$^{\circ}$方向屈服强度和峰值应力最大, RD-45^o其次, RD-0^o方向最小. 不同方向的绝热剪切变形行为也表现出较大的差异, RD-0^o方向的绝热剪切带内的变形相比其它2个方向均匀, 绝热剪切敏感性最弱. 基于剪切应力--剪切应变曲线和绝热剪切扩展所需能量, 定性解释了不同方向绝热剪切敏感性的差异. EBSD的实验观察表明, 3个方向上的剪切带内均有超细晶存在. 基于亚晶旋转动态再结晶机制, 理论计算结果证实了剪切带内发生再结晶的动力学可行性.

Key words: 冷轧Cu板动态强迫剪切各向异性织构亚晶旋转动态再结晶

Received: 19 August 2011

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Supported by National Natural Science Foundation of China (No.50871125) and Science and TechnologyFoundation of Central South University (No.2010QZZD014)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2012/V48/I3/315

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