Synthesis of Amorphous Ti50Al50 by Mechanical Alloying

摘要：

　　Blended elemental powders with the nominal compositions (at%) of Ti50Al50,was mechanically alloyed in a planetary ball milling system for up to 100h,an amorphous Ti50Al50 phase was obtained in the process.The amorphization process as a function of time of milling was monitored by scanning electron microscope,X-ray diffraction and transmission electron microscope.It is shown that,as first,Al atoms diffuse into the host lattice of hexagonal Ti; subsequently,the milling accumulates a critical density of disorder that causes the Ti (Al) crystalline phase to collapse into an amorphous phase,it is suggested the grain size condition for formation of amorphous phase is ≤12nm.On the basis of thermodynamic models,the formation of the amorphous phase is discussed.

关键词： Ti-Al alloy Mechanical alloying Amorphisation

作者: Zhang Junhong Xu Guohui Xu Yajuan He Yuehui

作者单位: Department of Materials Science and Engineering, Luoyang Institute Science and Technology,Luoyang, 4 State Key Laborator for Powder Metallurgy, Central South University, Changsha, 410083, China

会议类型: 国际会议

会议名称: the 2012 International Conference on Materials Science and Nanotechnology (2012年材料科学与纳米技术国际会议(ICMSN 2012))

会议地点: 广州

会议语种:英文

页码: 490-495

在线出版日期: 2012-11-16（万方平台首次上网日期，不代表论文的发表时间）