Influence of Ag micro-alloying on the thermal stability and ageing characteristics of a Cu-14Fe in-situ composite

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• 作者：Keming Liu^a ; ^b ; ^{jokeyliu@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhikai Huang^a ; Xingwang Zhang^a ; Deping Lu^b ; Andrej Atrens^c ; Haitao Zhou^d ; Yi Yin^a ; Jiuming Yu^b ; Wei Guo^b
• 关键词：Cu&ndash ; 14Fe ; Ag micro-alloying ; Microstructure ; Thermal stability ; Ageing characteristics
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：15 September 2016
• 年：2016
• 卷：673
• 期：Complete
• 页码：1-7
• 全文大小：1379 K

文摘

This paper studied the influence of Ag micro-alloying on the thermal stability and ageing characteristics of a deformation-processed Cu–14Fe in-situ composite prepared by thermo-mechanical processing. Heat treatment caused (i) edge recession, longitudinal splitting, cylinderization, break-up and spheroidisation of the Fe fibres in the Ag micro-alloyed Cu–14Fe in-situ composite, and (ii) recovery, recrystallisation and precipitation in the Cu matrix. Ag micro-alloying caused these processes to occur at lower temperatures. The index Z (a combination figure of merit that assesses the service performance) reached the peak value of 3.3×10⁷ MPa²·% IACS after isothermal heat treatment at 500 °C for 1 h, where IACS is the International Annealed Copper Standard, a measure of conductivity. The optimum combinations of tensile strength and conductivity were 1033 MPa and 56.6% IACS; 931 MPa and 58.9% IACS; or 851 MPa and 60.6% IACS. The tensile strength and conductivity of Ag micro-alloyed Cu–14Fe in-situ composite at η=7.8 after isochronal heat treatments were higher than those of the Cu–14Fe in-situ composite at each temperature.