Pore evolution regulation in synthesis of open pore structured Ti–Al intermetallic compounds by solid diffusion
Pore evolution regulation in synthesis of open pore structured Ti–Al intermetallic compounds by solid diffusion
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DOI：
10.1016/j.jallcom.2012.01.107
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发表时间：
2012-04
影响因子：
6.2
通讯作者：
Murong Chen;Yunling Jiang;Y. H. He;Liang-wu Lin;B. Y. Huang;C. Liu
中科院分区：
文献类型：
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作者：
Murong Chen;Yunling Jiang;Y. H. He;Liang-wu Lin;B. Y. Huang;C. Liu
采用基于扩散模型模拟计算的方法探讨了多孔Ti-Al金属间化合物的孔隙演化规律。根据Ti-Al压坯的基本结构特征，采用夹层核壳结构粉末扩散偶模型和两种孔隙演化条件，揭示了Ti-Al多孔合金中主要由柯肯达尔效应引起的孔隙演化规律。孔隙演化层的生长与初始Al壳的消耗一致，孔隙演化层的尺寸与Ti颗粒核的尺寸无关。建立了反映演化孔隙度和扩散成分物理参数的方程。演化孔隙率被证实是扩散元素浓度和密度的函数。
A method based on diffusion model simulation and calculation was used to discuss the pore evolution regulation of porous Ti–Al intermetallic compounds. According to the basic structure characteristics of Ti–Al compacts, a sandwich core–shell structured powder diffusion couple model and two pore evolution conditions were used to reveal the pore evolution regulations in Ti–Al porous alloy, which is mainly caused by the Kirkendall effect. The growth of the pore evolution layer is consistent with the consumption of the initial Al shell, and the dimension of the pore evolution layer is independent on the dimension of the core of Ti particle. An equation reflecting the evolution porosity and the physical parameters of diffusion components was established. The evolution porosity was confirmed to be a function of the concentration and density of diffusion elements.