Influence of Dissolved Precipitated Phases on Mechanical Properties of Severely Deformed AI-4 wt% Cu Alloys
Microstructural evolution and mechanical properties of Al-4.11 wt% Cu alloys subjected to multi-axial compression (MAC) and subsequent annealing were investigated. To clarify the influence of precipitated phases on mechanical properties, special samples containing only one kind of precipitated phase were prepared. During MAC at room temperature, 9-phase-contained and 6-phasecontained samples simultaneously showed increased strength and ductility as a function of MAC passes. This was ascribed to the considerable dissolution of precipitated phases induced by MAC that formed a supersaturated solid solution. In subsequent annealing at 393 K for 1 h, new precipitated phases appeared and the strength and ductility of deformed samples increased as precipitation proceeded. Additionally, transmission electron microscopy indicated that the MAC process accelerated the phase precipitations. Annealed mechanical properties were a function of MAC passes, annealing time, and temperature. In this study, an optimum comprehensive mechanical property was achieved in the 9-phasecontained specimen, after eight passes of MAC and 1 h annealing at 393 K.
Nan Hu Xiao-chang Xu
School of Materials Science and Engineering,Central South University,Changsha 410083,China Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central S
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
1021-1026
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）