Mechanical Properties of Ultra-fine Grain Copper Produced by Equal Channel Angular Pressing （ECAP）

Wang Qingjuan; Wang Qingping; Du Zhongze

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Mechanical Properties of Ultra-fine Grain Copper Produced by Equal Channel Angular Pressing （ECAP）
Vol. 31, Issue 10, Pages: 887-890(2011)
Published： 2011 ，
DOI：

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[1]王庆娟,王清平,杜忠泽.等径弯曲通道变形制备超细晶铜的力学行为[J].特种铸造及有色合金,2011,31(10):887-890.

Wang Qingjuan, Wang Qingping, Du Zhongze. Mechanical Properties of Ultra-fine Grain Copper Produced by Equal Channel Angular Pressing （ECAP）. [J]. Special Casting & Nonferrous Alloys 31(10):887-890(2011)
[1]王庆娟,王清平,杜忠泽.等径弯曲通道变形制备超细晶铜的力学行为[J].特种铸造及有色合金,2011,31(10):887-890. DOI：

Wang Qingjuan, Wang Qingping, Du Zhongze. Mechanical Properties of Ultra-fine Grain Copper Produced by Equal Channel Angular Pressing （ECAP）. [J]. Special Casting & Nonferrous Alloys 31(10):887-890(2011) DOI：

摘要

利用显微硬度计和电子拉伸机

研究了等径弯曲通道变形（Equal Channel Angular Pressing-ECAP）前后纯铜的硬度、力学性能

分析了ECAP制备超细晶铜（UFG）的强化机制。结果表明

纯铜在ECAP变形中出现了加工硬化-软化的饱和现象

即流动应力随变形量增加先迅速增大

在8道次达到最大（σb=410MPa）

而后趋于饱和。强度可达400～410MPa

伸长率为12%～20%

硬度（HV）为140～146。利用MA模型合理解释了ECAP制备超细晶材料的拉伸力学行为。

Abstract

The micro-hardness and tensile properties of ECAPed and pre-ECAP pure copper were investigated by the Vickers micro-hardness and electronic tensile machine. Furthermore

the strengthening mechanism of ultrafine-grained copper produced by the ECPA was analyzed. The results show that the saturation of strain-hardening and strain-softening occurs in copper subjected to ECAP

namely

the flow stress is increased sharply with increasing in strain to the maximum value at 8 passes

and then tends to be saturated

which can be attributed to the saturation of grains size and dislocation density after ECAP. The mechanical properties of the ultrafine-grained copper can reach 400～410 MPa in tensile strength

12%～20% in elongation and HV140～146 in hardness. Tensile behavior of the ECAPed ultrafine-grain copper is described by the MA model.