【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。更多还原

【Abstract】 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 situ filamentary composites increase obviously the precipitate strengthening effect and rise the temperatures of about 100 ℃ for the discontinuous precipitation.更多还原