Application of an analytical phase transformation model  

作　　者：Feng Liu, Changlin Yang, Wei Yang, Gencang Yang, and Yaohe Zhou State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China 

出　　处：《International Journal of Minerals,Metallurgy and Materials》2007年第S1期54-58,共5页矿物冶金与材料学报（英文版）

基　　金：The work was financially supported by the National Natural Science Foundation of China (No.50501020 and 50395103);the Fun-damental Research Project of National Defense of China (No.A2720060295);the Scientific Research Foundation for the Returned Overseas Chinese Scholars, the Ministry of Education of China (No.N6CJ0002);the New Century Excellent Person Supporting Project (No.NCET-05-870).]

摘　　要：An analytical phase transformation model has been used to study the kinetics of crystallization of amorphous alloys sub- jected to either isothermal or isochronal anneals. The model has been applied to Mg82.3Cu17.7 and Pd40Cu30P20Ni10, employing iso- thermal and isochronal differential scanning calorimetry. Applying different combinations of nucleation and growth mechanisms to the same experiments, the nucleation and growth modes dominating the crystallization and the values for the corresponding kinetic parameters, including the constant activation energies for nucleation and growth, have been determined. Further, the influence of isothermal pre-annealing on subsequent isochronal crystallization kinetics, involving a gradual change of nucleation mode up to site saturation with increase of pre-annealing, can be analyzed.An analytical phase transformation model has been used to study the kinetics of crystallization of amorphous alloys sub- jected to either isothermal or isochronal anneals. The model has been applied to Mg82.3Cu17.7 and Pd40Cu30P20Ni10, employing iso- thermal and isochronal differential scanning calorimetry. Applying different combinations of nucleation and growth mechanisms to the same experiments, the nucleation and growth modes dominating the crystallization and the values for the corresponding kinetic parameters, including the constant activation energies for nucleation and growth, have been determined. Further, the influence of isothermal pre-annealing on subsequent isochronal crystallization kinetics, involving a gradual change of nucleation mode up to site saturation with increase of pre-annealing, can be analyzed.

关 键 词：phase transformation metallic glass heat treatment crystal growth CALORIMETRY 

分 类 号：TG139.8[一般工业技术—材料科学与工程]