钨合金力学行为的计算机数值模拟─—宏观力学性能

Computer Numerical Simulation of Mechanical Behavior of Tungsten Heavy Alloys-Macro-mechanical Properties

在微观力学行为分析的基础上，对90W合金宏观力学性能及其与微观结构因素（粘结相力学参数）之间的关系进行了计算机数值模拟研究．结果表明：钨合金性能与粘结相力学参数密切相关．随着粘结相弹性模量增加，合金的抗拉强度增加，但延伸率降低．当粘结相屈服强度800MPa时，合金抗拉强度随粘结相屈服强度增加而增大，在粘结相屈服度为800MPa时达到最大值．随粘结相抗拉强度增加，合金抗拉强度和延伸率均呈近似线性规律增加．合金延伸率对粘结相应变硬化模量极为敏感．

On the basis of analyzing the micro-mechanical behavior, the macro-mechanical properties of 90 W heavy alloy and the effects of microstructural parameters(mechanical properties of matrix phase) on them have been calculated by computer numerical simulation. The mechanical properties of the alloy have been found to depend heavily on mechanical parameters of matrix phase. As the elastic modulus of matrix phase increases, the tensile strength of the alloy increases, while its elongation decreases. The tensile strength of the alloy has a maximum at the yield strength of matrix phase 800 MPa. When the yield strength of matrix phase<800 MPa, the tensile strength of the alloy increases with its increase, however, a opposite variation occurs when the yield strength of matrix phase> 800 MPa if the mechanical parameters except tensile strength of matrix phase are constant, both the tensile strength and the elongation of the alloy increase linearly with the increase of tensile strength of matrix phase, because the ductility of matrix phase increases with its tensile strength in this case. The elongation of the alloy is very sensitive to hardening modulus of matrix phase. As the hardening modulus increases the elongation of the alloy exponentially decreases.