Cu-Ag合金原位纤维复合材料的沉淀强化效应  

Precipitate Strengthening of Cu-Ag Alloy in situ Filamentary Composites

作　　者：宁远涛[1] 张晓辉[1] 吴跃军[1] 

机构地区：[1]昆明贵金属研究所,云南昆明650221

出　　处：《稀有金属材料与工程》2007年第10期1807-1810,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50371031)

摘　　要：研究了形变态Cu-10Ag和Cu-10Ag-RE合金原位纤维复合材料时效强化效应。在300℃以下温度时效显示连续沉淀并导致合金强化,在300℃以上温度时效显示不连续沉淀,析出片层状Ag沉淀并与Cu基体保持共格位向关系。在真应变η=6时效,合金具有高的时效强化效应,其极限拉伸强度增幅可达约12%;而在真应变η=9.8时效,时效强化效应减弱,极限拉伸强度增幅约4%～5%。微量Ce或Y添加剂提高Cu-10Ag合金的时效强化效应及不连续沉淀温度。The aging strengthening effect of Cu-10Ag and Cu-10Ag-RE alloy in situ filamentary composites was studied. For aging at temperatures below 300 ℃, the alloys present a continuous precipitation process, which make the ultimate tensile strength increased. For aging at temperatures above 300℃, the alloys present a discontinuous precipitation process, in which the lamellar Ag precipitate with coherent orientation relationship to Cu crystals is separated from Cu matrix. For alloys with lower true strain as η= 6, the aging presents higher precipitate strengthening effect with the strength increment about 12%. For alloys with higher true strain as η= 9.8, the precipitate strengthening effect is weakened with the tensile strength increment of about 4%-5% and the aging peak temperature is reduced. The trace RE（RE=Ce or Y） additions in Cu-10Ag alloy in sire filamentary composites increase obviously the precipitate strengthening effect and rise the temperatures of about 100℃ for the discontinuous precipitation.

关 键 词：原位复合材料 CU-AG合金 沉淀强化 微量稀壬添加剂 极限拉伸强度 

分 类 号：TB331[一般工业技术—材料科学与工程]