Effect of the repeated melting of mother ingot on the stability of icosahedral phase precipitated from Zr-Al-Ni-Cu-Ag glass  

作　　者：闫志杰 李金富 王鸿华 何顺荣 周尧和 

机构地区：[1]State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, China [2]Taiyuan Heavy Machinery Institute, Taiyuan 030024, China

出　　处：《Science China(Technological Sciences)》2003年第6期639-644,共6页中国科学（技术科学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.50071032).

摘　　要：Differential scanning calorimetry (DSC) shows that repeated melting of mother ingot improves the stability of icosahedral phase (I-phase) precipitated from Zr65Al7.5Ni10Cu12.5Ag5 glass. The Kissinger analysis of crystallization implies that the effective activation energies for the precipitation of I-phase and its decomposition considerably increases due to the repeated melting of mother ingot. Repeated melting of mother ingot refines ingot microstructure. Because of structure heredity, the size of the short-range orders (SROs) in the glassy alloy produced from the mother ingot with finer microstructure becomes smaller, which makes the rearrangement of atoms more clifficult, and the I-phase more stable.

关 键 词：metallic glass  ICOSAHEDRAL phase  decomposition  SHORT-RANGE order. 

分 类 号：O614[理学—无机化学]