由钨合金的两相参数计算其宏观抗拉强度

Calculation of Macro-tensile Strength with Two Phase Parameters for Tungsten Alloy

钨合金是由钨颗粒相和基体组成的两相材料。利用Eshelby方程和Mori-Tanaka平均应力概念以及本文给出的增量法,可由钨颗粒相的形状、体积份数及两相力学性能参数计算得到钨合金材料的宏观抗拉强度。文内对特定钨合金进行了计算分析。分析表明,随工艺处理变形量的增加,钨合金材料的脆性增加,对于工艺处理变形量较小的钨合金,首先在基体相中达到拉伸破坏;而对于工艺处理变形量较大的钨合金,首先在钨颗粒相中达到拉伸破坏。本文对钨合金材料宏观抗拉强度的计算结果与试验结果一致。

Tungsten alloy is a bi-phase material composed of tungsten grain and matrix phases. The macro tensile strength of tungsten alloy was obtained according to the shape and the volume fraction of W-phase and the mechanical parameters of the two phases by using the Eshelby equations, Mori-Tanaka concept of average stress and the incremental method which was proposed in this paper. A special tungsten alloy was analyzed and the results show that the brittleness of the tungsten alloy increases with the increment of the amount of deformation in the metallurgy processing; the tensile failure is of first occurrence in the matrix phase of the tungsten alloy for smaller amount of deformation in the metallurgy processing and in the W-phase of the tungsten alloy for larger amount of deformation in the metallurgy processing. The computational results for the tensile strength of the tungsten alloy are in accordance with that of experiments.