【摘要】 通过建立正四面体的烧结模型,数学推导了置氢钛合金粉末烧结颈与烧结体相对密度的表达式,结合动力学实验研究了置氢TC4钛合金粉末模压成形固结加工过程中的动力学问题。结果表明:置氢TC4钛合金粉末烧结过程中的物质迁移机构由体积扩散为主的迁移机制向体积扩散和晶界扩散共同作用的物质迁移机制过渡,并由此得到了置氢TC4钛合金粉末材料模压成形固结过程的动力学方程,置氢量是影响置氢TC4钛合金粉末烧结体相对密度的最重要因素之一。更多还原

【Abstract】 The kinetics problems of consolidation process of hydrogenation titanium alloy powder were studied by means of establishing regular tetrahedron model for powder sintering and deducing expression of sintering neck and relative density of hydrogenated titanium alloy powder with sintering kinetics experiment.The results show that the transport mechanisms of hydrogenated TC4 titanium alloy powder sintering process was changed from the main transport mechanisms of volume diffusion to the interaction transport mechanisms between volume diffusion and grain boundary diffusion.And according to the transport mechanisms of hydrogenated TC4 titanium alloy powder sintering process,the kinetics equation for the consolidation process of hydrogenated TC4 titanium alloy powder by die forming and sintering was obtained.The hydrogen content was the most important factor of effecting sintered body relative density of hydrogenated TC4 titanium alloy powder.更多还原