Diffusional Reaction Mechanism during the Formation of AlB2 Phase

作者：Xiong Xiaomei; Yang Fang^*; Wang Lijun; Yan Guo; Wang Qingyang; Liu Guoqing; Feng Jianqing; Li Chengshan; Liu Xianghong; Feng Yong

来源：Rare Metal Materials and Engineering, 2014, 43(7): 1666-1670.

• microstructure
• AlB2
• diffusion
• sintering

A diffusion couple method was used to monitor the atom diffuseness of Al and B. Based on the classical sintering theory, the forming process of polycrystalline AlB2 was systematically investigated. The results of diffusion experiment indicate that the diffusivity of Al is much stronger than that of B and the formation of AlB2 can be attributed to the diffusion of Al into B. The reaction between Al and B can take place at solid-solid state and liquid-solid state. In the solid-solid reaction stage, the solution activated regions form ahead at the contact areas between Al and B particles by diffusing atoms, and then AlB2 particles is precipitated from these regions. In this state, the diffusivity of Al is the crucial limit factor to the further formation of AlB2. While, in the liquid-solid reaction stage, the wetting ability of the melting Al to solid phase is the crucial limit factor. Key words: microstructure; AlB2; diffusion; sintering

• 出版日期2014-7
• 单位东北大学; 西北有色金属研究院