摘要
采用单辊快速凝固方法制备出高强度高导电的Cu－Cr－Zr合金，对时效过程中电阻率和显微硬度的变化进行了研究，用扫描电镜和透射电镜对析出过程中晶粒与析出相的形态与大小及位错的组态进行分析．结果表明：时效初期电阻率的下降是溶质原子借高浓度的空位迅速偏聚和析出所致。在500℃温度下，时效30min，合金的导电率可达82％IACS，显微硬度为Hv202。细小弥散分布的析出相是导致高硬度的主要原因。
The Cu-Cr-Zr alloy with attractive combinations of hardness and electric conduCtivity was produced by single-roller melt spinning method. The changes of its electric resistivity and microhardness were systematically investigated for successive aging processes. The grain structures, morphology and she of the precipited phasesas well as the dislocation configuration were analysed by means of scanning electron microscope and transmission electron microscope. It is found that the decrease of electric resistivity in the initial stage of the aging could be attributed to the rapid segregation of solute atoms and the resulted preciptations through the highly concentrated vacancies formed during the rapid solidification process. The electric resistivity of about 82% IACS and microhardness about Hv 202 were achieved after aging the alloy for 30 min at 550℃.The more fmer grain structures and the dispersed distribution of the precipited phases upon the aging contribute to the higher microhardness.
出处
《有色金属》
CSCD
1999年第1期70-73,共4页
Nonferrous Metals
基金
国家自然科学基金!59671043
