铬锆微合金化铜合金时效强化机制研究  

Study on Aging Strengthening Mechanism of Cr-Zr Microalloyed Copper Alloy

作　　者：韩茂盛[1] 刘乐乐 梁晨 马艳霞[1] HAN Maosheng;LIU Lele;LIANG Chen;MA Yanxia(No.725 Research Institute of CSIC,Luoyang 471000,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471000

出　　处：《热加工工艺》2018年第24期238-241,共4页Hot Working Technology

摘　　要：测试了Cu-Cr-Zr合金不同时效工艺后的力学性能,通过金相显微镜(OM)以及透射电子显微镜(TEM)观察了合金的显微组织。结果发现,合金经450℃/4 h时效达到峰值时效强度,强度的提高主要来源于弥散分布的共格析出相。按共格强化机制,运用公式进行推导,估算了合金时效后的最大拉伸应力增量(Δσcsmax)和抗拉强度(σb)的范围,所建公式较好地反映析出强化型铜合金时效过程中的强度变化。试验结果和计算结果吻合较好,对实际生产应用有一定的指导意义。The mechanical properties of Cu-Cr-Zr alloy with different aging process were tested, and the microstructure of the alloy was observed by metallographic microscope(OM) and transmission electron microscope(TEM). The result shows that, after 450 ℃/4 h aging, the peak aging strength of the alloy is obtained, and the increase of the strength is mainly due to the dispersive coherent precipitation. The maximum tensile stress increment(Δσcsmax) and the range of tensile strength(σb) of the alloy after aging were estimated according to the formula of coherent strengthening mechanism. The model can reflect the strength change during the aging process of precipitated strengthened copper alloy. The experimental results are in good agreement with the calculated results, which has a certain guiding significance for practical production and application.

关 键 词：CU-CR-ZR合金 显微组织 拉伸强度 时效强化 强化机制 

分 类 号：TG156.92[金属学及工艺—热处理] TG166.2[金属学及工艺—金属学]