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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Heat Treatment on the Microstructure and Properties of Deformation-Processed Cu-7Cr In Situ Composites
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Effect of Heat Treatment on the Microstructure and Properties of Deformation-Processed Cu-7Cr In Situ Composites

机译：热处理对变形加工Cu-7Cr原位复合材料组织和性能的影响

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摘要

The effect of heat treatment on the microstructure, electrical conductivity, and tensile strength of deformation-processed Cu-7Cr in situ composites produced by thermo-mechanical processing was investigated. The Cr fibers in the Cu-7Cr in situ composite underwent coarsening, break-up, and spheroidization after exposure to elevated temperatures. The conductivity and tensile strength of the in situ composite first increased with increasing isochronal heat treatment temperature, reached a peak value, and decreased at higher temperatures. The isothermal heat treatment temperature was determined to be 625 degrees C. The Z (Z is an optimization parameter to evaluate the service performance of deformation-processed Cu-based in situ composites) value of the deformation-processed Cu-7Cr in situ composite, at eta = 7 (eta is a cumulative cold deformation strain) after the heat treatment at 625 degrees C for 1 h, reached the peak value of 3.46 x 10(7) MPa2 % International Annealed Copper Standard (IACS). The isochronal heat treatment time was determined to be 1 h. The following combination of conductivity and tensile strength of the deformation-processed Cu-7Cr in situ composite with a cumulative cold deformation strain of eight after isochronal aging treatments for 1 h could be attained respectively as (i) 76.0% IACS and 889 MPa; (ii) 76.8% IACS and 876 MPa; or (iii) 77.5% IACS and 779 MPa.
机译：研究了热处理对热机械加工变形后的Cu-7Cr原位复合材料的显微组织，导电率和拉伸强度的影响。暴露于高温后，Cu-7Cr原位复合材料中的Cr纤维发生粗化，破裂和球化。原位复合材料的电导率和拉伸强度首先随着等时热处理温度的升高而增加，达到峰值，然后在较高的温度下降低。确定等温热处理温度为625摄氏度。变形处理后的Cu-7Cr原位复合材料的Z值（Z是评估变形处理后的Cu基原位复合材料使用性能的优化参数），在625摄氏度下热处理1小时后，在eta = 7（η是累积的冷变形应变）下，达到3.46 x 10（7）MPa2％国际退火铜标准（IACS）的峰值。等时热处理时间确定为1小时。等时效处理1 h后，经过变形处理的Cu-7Cr原位复合材料的电导率和拉伸强度的组合，累积冷变形应变为8，分别为（i）76.0％IACS和889 MPa; （ii）76.8％的IACS和876 MPa;或（iii）77.5％IACS和779 MPa。

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