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Characterization of the prior particle boundaries in a powder metallurgy ti2alnb alloy

Journal of Materials Science & Technology 2019年第11期35卷 2513-2525页

作者： Jinhu Zhang Jinmin Liu Dongsheng Xu Jie Wu Lei Xu Rui Yang Institute of Metal Research Chinese Academy of Sciences

ti2 alnb-based alloy powder metallurgy(PM)compacts were prepared via hot isostatic pressing(HIP)under relatively low temperature(920 and 980℃)and at certain pressure(130 MPa).The microstructure,composition and orientation of B2,α2 and O phases in the compacts were characterized and analyzed with an aim to investigate the effect of unsuitable HIPping parameters on the appearance of prior particle boundary(PPB),which seriously affects the mechanical properties of the alloy.The results show that moreα2 phase is the characteristics of the PPB in ti2alnb-based alloy when HIPped at relatively low temperature.Increasing HIPping temperature to the upper part of the two-phase region can effectively inhibit the formation of PPB.Electron backscatter diffraction measurements show the specific orientation relationship between phases,which helps us understand the origin of a2 and O phase and the corresponding transformation path.The HIPping at a higher temperature can weaken the micro-texture intensity of theα2 and O phase due to the increase of misorientation in B2 phase.Theα2 phase at cell wall keeps the Burgers orientation relationship(BOR)with the grain on one side,and does not satisfy the BOR with the other.It is found that some O phase variants inside the cell HIPped at 980℃can only maintainα2-O OR withα2 owing to theα2→O phase transformation forming the O phase,while these O variants deviate from B2-O OR with B2 phase.

关键词： Powder metallurgy titanium alloys Hot isostatic pressing Prior particle boundary(PPB) Microtexture ti-22al-24nb-0.5mo alloy

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Effect of Hot Isostatic Pressing Loading Route on Microstructure and Mechanical Properties of Powder Metallurgy ti_2alnb alloys

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Journal of Materials Science & Technology 2017年第2期33卷 172-178页

作者： Jie wu Ruipeng Guo Lei Xu Zhengguan Lu Yuyou Cui Rui Yang Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering Northeastern University Shenyang 110819 China

In this work, hot isostatic pressing （HIPing） technique was used to densify the ti2AInb pre-alloyed powder. The influence of HIPing loading route parameters （temperature and rates of heating and pressurizing） on microstructure and properties of PM ti2AInb alloys was studied. The results showed that HIPing loading route parameters affected the densification process and mechanical properties （especially high temper- ature rupture lifetime） of PM ti2AInb alloys in the present work. A finite element method （FEM） model for predicting the final densification was developed and was used to optimize the HIPing procedure.

关键词： ti-22al-24nb-0.5mo alloy Hot isostatic pressing Porosity Non-uniform densification Rupture lifetime

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