Effect of Ingredients and Preparation Process on the Microstructure and Mechanical Properties of TZM Alloy AITranslate

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Chinese Library Classification Number:TG146.412[金属学及工艺—金属材料]

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TZM alloys were prepared by doping TiH₂+ZrH₂,TiC+ZrC and TiC+ZrC+HfC,respectively,and the microstructure and mechanical properties of the alloys prepared by different sintering and vacuum hot pressing processes.The results indicate that the density of the alloys can be improved by changing the form of Ti and Zr addition and adding HfC.Compared with the addition of TiH₂+ZrH₂,the density of the alloys prepared by adding TiC+ZrC and TiC+ZrC+HfC increases from 9.51 g/cm³ to 9.71 g/cm³ and 9.81 g/cm³,respectively.The relative density of the alloys with different ingredients is significantly improved when hot pressing is carried out after sintering,in which maintaining pressure after pressurization is more effective in increasing the relative density of the alloys.The original ingredients with different doping methods undergo decomposition and diffusion during the sintering process of the alloys,forming Mo solid solution phase.In comparison with the addition of TiH₂+ZrH₂,the alloys prepared by adding TiC+ZrC and TiC+ZrC+HfC have smaller grains,and the added TiC,ZrC and HfC particles can achieve grain refinement through dissolution and precipitation.Adding HfC beyond TiC+ZrC can increase the yield strength of the alloy prepared by the same process from 314 MPa to 390 MPa,with an improvement of about 24%.HfC is beneficial for the purification of grain boundaries and the refinement of Mo matrix grains,thereby improving the strength of molybdenum alloy.