基于TiH2粉末制备Ti-13Nb-13Zr合金的微观组织与结构

Microstructure of Ti-13Nb-13Zr alloy prepared by powder metallurgy method using TiH2 as raw material

摘要:

利用TiH2、ZrH2的脱氢特性,结合粉末冶金方法,TiH2、Nb和ZrH2粉末经混合球磨、压制成型,真空烧制得到Ti-13Nb-13Zr合金,对样品进行金相显微镜、SEM、XRD分析,结果表明：烧结坯体相对密度达到92.2%,观察金相图及SEM结果,得出合金主要组织为α+β型片状魏氏组织, 且在合金形成过程中β稳定元素的Nb发挥作用,使得钛的β相在降温完成后仍稳定存在；XRD结果表明：α-Ti及α-Zr为六方密排(hcp)结构、β-Ti、Nb及β-Zr同为体心立方(bcc)结构。

Abstract:

The sintering process is formulated by dehydrogenation properties of titanium hydride and zirconium hydride,combined with powder metallurgy method,Ti-13Nb-13Zr alloy is prepared by die pressing and vacuum sintering titanium hydride powde,niobium and zirconium hydride powder.The sample is investigated by metallographic microscope,SEM,XRD.The result shows that through this process, the relative density of sintered body is 92.2%.SEM result shows that platelet α and platelet β exists in the alloy.During the formation of the alloy,as beta stable element niobium makes the β-phase is still in the alloy after cooling.Analysis based on XRD data reveals the presence of the α-Ti andα-Zr are hcp and the β-Ti、Nb and β-Zr are bcc.