钨合金基体相原位细观性能的测定

In Situ Determination of Micro-properties of Tungsten Alloy Matrix

为研究钨合金材料基体相的细观本构关系,采用纳米压痕实验,测定了钨合金基体相微观硬度和平均弹性模量.由纳米压痕实验得到的载荷-位移关系,利用材料的弹塑性硬化模型,经有限元计算,得到了基体相细观屈服强度、硬化模量、弹塑性性能参数和应力-应变关系曲线.分析结果表明,合金成分及变形强化是影响钨合金强度和硬度的两个基本因素.钨合金基体相微观强度和硬度随变形量或钨含量增大而增大.

To obtain the micro-properties of tungsten alloy matrix, its micro-hardness and micro-elastic modulus were measured by nano-indentation experiments. The micro-yield strength, micro-hardening modulus, elastoplastic parameters and the stress-strain relationship of the tungsten alloy matrix were determined using the finite element method, a hardening model, and the load-displacement relationship obtained from nano-indentation experiments. Analyses of the results show that the composition of the alloy and deformation strengthening are two basic factors to influence the microproperties of tungsten alloy matrix. The micro-hardness and micro-yield strength of the alloy matrix increase with an increase in deformation or in the concentration of tungsten.