In Situ Determination of Micro-properties of Tungsten Alloy Matrix
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摘要: 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.Abstract: 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 micro-properties 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.
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