Strengthening of Calcium Microalloying in Pure Gold
The mechanical properties of calcium (Ca) microalloyed 24 carat gold (Au99.9Ca0.1) were measured and the corresponding microstructure was observed by TEM in order to investigate the strengthening mechanism. It was observed that the microalloying of 0.1 wt％ Ca improved the tensile strength (by 79％ and 57％ for the rolling and annealing states, respectively), hardness and E-Modulus as well as reduced the ductility of the 24 carat Au. Dispersed nano-sized precipitates and high density deformation twins were found in the rolled Au99.9Ca0.1, which are attributed to be the major strengthening factors. The twins subsided after annealing and the strengthening of the annealed Au99.9Ca0.1 is mainly contributed by the coarsened semi-coherent precipitates.
microanalysis non-ferrous alloys precipitation twinning
JIN Mingjiang GENG Yonghong JIN Xuejun
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
国际会议
5th International Conference Platinium Metals(第五届国际贵金属会议)
昆明
英文
96-101
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）