Effect of second phase precipitation behavior on mechanical properties of casting Al-Cu alloys
The effect of the second phase precipitation behavior on the mechanical properties and fracture behavior of the modified casting Al-Cu alloys was investigated.The tensile strength of the alloys increases firstly and then decreases due to the appearance of θ precipitation phases,which increases firstly and then become coarser with the aging time increasing from 10 h to 20 h at 155 ℃.The strength of the alloys reaches the peak,resulting from and θ precipitation phases,and decreases due to phases becoming coarser and θ precipitation decreasing with the aging time increasing from 10 h to 20 h at 165 ℃. phase becoming coarser and θ precipitation decreasing result in the strength of the alloys drastically decreasing after aging at 175 ℃ for 20 h.The ductility remains high level with increasing aging time at 155 ℃.The ductility irregularly changes as aging time prolongs at 165 ℃.The ductility is very low and at the same time gradually decreases with increasing aging time at 175 ℃.The Al-Cu alloy with a promising combination of tensile strength and ductility of about 474 MPa and 12.0％ after aging at 165 ℃ for 10 h is due to a dense,uniform distribution of precipitation phases together with a heterogeneous distribution of θ precipitations.
Al-Cu alloys heat treatment mechanical properties precipitate
ZHAO Wen-gui JIANG Qi-chuan WANG Jin-guo LI Yong HOU Jing-qi
Key Laboratory of Automobile Materials of Ministry of Education,Department of Materials Science and Engineering,Jilin University,Changchun 130025,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）