掺杂与钽条和钽丝组织性能关系的研究

通过金相显微分析、扫描电镜观察、电子探针分析、密度测试、TEM观察和力学性能测试研究了掺杂与钽条和钽丝组织和性能的关系.结果表明:随着掺杂量的增加,钽条晶粒变细,且掺B比掺A细化晶粒的效果更加明显,但随着掺B量的增加烧结变得不充分,钽条密度偏低;随着掺杂量的增加,钽丝的再结晶温度升高,组织晶粒细化,其中掺B比掺A细化效果更加明显;随着掺杂量的增加钽丝室温抗拉强度增加,伸长率则随着掺A量的增加而降低,随着掺B量的增加而升高,且掺B较掺A强化效果明显,B的加入还起到了细晶韧化效果.

Relationship between doping with texture and property of tantalum bar and wire

Relationship between doping with microstructure and property of tantalum bar and wire is carefully investigated through observation of microstructure,SEM fractograph,analysis of electric probing,testing of density,observation of TEM and testing of mechanical property at room temperature.It is illustrated that the grain of tantalum bar microstructure after sintering reduces with the increment of dopant quantity,and the effect of dopant B on reduction of the grain is more obvious than that of dopant A,even that sintering is becoming insufficient and the density of tantalum bar tends to be low with the increment of dopant B.The recrystallization temperature of tantalum wire increases and the grain of texture can be reduced with the increment of dopants quantity.At the same time,the effect of dopant B on reduction of the grain is more obvious than that of dopant A.The tensile of tantalum wire at room temperature increases with the increment of dopants quantity,while its elongation is lowered with the increment of dopant A quantity and rises with the increment of dopant B quantity.And the strengthening effect of dopant B is more obvious than that of dopant A.Additionally,dopant B plays an important role in fine grained toughening.