Coherent strengthening of aging precipitation in rapidly solidified Cu-Cr alloy
(Institute of Materials Science and Engineering; Xi’an Jiaotong University; Xi’an 710049; P. R. China；
Department of Materials Engineering; Luoyang Institute of TeChnology; Luoyang 471039; P. R. Chin)
Department of Materials Engineering; Luoyang Institute of TeChnology; Luoyang 471039; P. R. Chin)
Abstract: A single-roller melt spinning method was used to preduce Cu-Cr microcrystalline alloy ribbons.Through proper aging treatment, the strength and hardness of the alloy were remarkably enhanced while the conductivity only had a minimal decrease. Grain refinement and coherent dispersion strengthening were proved to be the major factors contributing to the improvement of strength and hardness of the alloy after aging. The degree of coherent strengthening was almost identical with that calculated by Gerod equatbo. Compared with the solid solution quenched Cu-Cr alloy, the peak hardness was increased 2. 6 times, in which about 27% was attributed to the grain refinement and 73 %, in turn, provided by coherent strengthening due to aging precipitation. Neither the soid solution strengthening nor vacancy strengthening had detectable effect on the strength and hardness of the rapidly solidified Cu-Cr alloy.
Key words: rapid solidification; Cu-Cr alloys; aging precipitation; coherent strengthening