Investigation of the phase separation dynamic properties in thermally aged Fe-Cr binary alloys
The phenomenological and analytical study of phase separation dynamic properties of the Fe-Cr binary alloy has been carried out. Experimental results show that thermal aging causes the Cr-rich phase precipitate and form clusters. Nano-indentation results show that the nano-indentation hardness increases while the nano-indentation plastic energy decreases. A phase-field thermodynamic model has been developed to investigate the phase separation dynamics of the Fe-Cr alloy. Constitutive relations have been adopted with the chemical energy, interfacial energy and effective elastic energy as the key ingredients. Numerical results show clearly the micro structure morphology and the phase separation coarsening with aging time. The scattering pattern becomes clearer and the corresponding radius becomes smaller along with the increasing aging time. The content concentration evolution, the content statistics evolution and the volume fraction for different aging time are investigated. The pattern size increases firstly then decreases and enters a more stable stage. Two-dimensional simulations of aggregation in the bulk are in remarkably good agreement with experimental results and theoretical considerations.
Zhao-Xi WANG Fei XUE Guo-Dong ZHANG Hui-Ji SHI Jian LV Guo-Gang SHU
Applied Mechanics Laboratory, Tsinghua University, Beijing 100084, China Suzhou Nuclear Power Resear Suzhou Nuclear Power Research Institute, Suzhou 215004, China Suzhou Nuclear Power Research Institute, Suzhou 215004, China School of Mechanical and Power Enginee Applied Mechanics Laboratory, Tsinghua University, Beijing 100084, China The Hong Kong Polytechnic University, Kowloon, Hong Kong
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）