真空烧结和氢致相变烧结制备Ti-xFe(x=1%,5%,10%,15%)合金的组织演变过程和性能研究  

Microstructure Evolution and Properties of Ti-xFe(x=1%, 5%, 10%, 15%) Alloys Prepared by Vacuum Sintering and Hydrogen Induced Phase Transformation Sintering

作　　者：闫志巧 陈峰 许荣君[1,3] 刘咏 刘彬[3] Yan Zhiqiao;Chen Feng;Xu Rongjun;Liu Yong;Liu Bin(Guangdong Institute of Materials and Processing,Guangdong Academy of Sciences,Guangzhou 510650,China;Engineering Research Center for Powder Metallurgy of Titanium&Rare Metals,Guangzhou 510650,China;Central South University,Changsha 410083,China)

机构地区：[1]广东省科学院广东省材料与加工研究所,广东广州510650 [2]国家钛及稀有金属粉末冶金工程技术研究中心,广东广州510650 [3]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2020年第3期1031-1037,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51404077);广东省自然科学基金(2015A030313775);广东省科学院实施创新驱动发展能力建设专项(2019GDASYL-0402006,2018GDASCX-0117);广东省公益研究与能力建设项目(2017A070701029);广东省重点领域研发计划项目(2018B090904004);广州市科技计划项目(ZWY201704003,201508030032)。

摘　　要：以HDH-Ti粉和羰基Fe粉为原料,经冷等静压成形后,分别采用真空烧结和氢致相变烧结(HSPT)制备Ti-xFe(x=1%、5%、10%和15%,质量分数)合金,对比研究了2种烧结工艺中合金的密度、物相、组织演变过程和显微硬度等性能。结果表明:HSPT合金含有较多的孔隙,密度明显低于真空烧结合金的密度。2种方法制得合金中的β相含量均随Fe含量的增加而增加,且在HSPT制备的Ti-15Fe合金出现了Ti Fe中间相。HSPT合金制备过程中,H对Fe元素的扩散产生了显著的抑制作用。当Fe含量≥5%时,脱氢后在合金的β相内部析出短棒状或针状的次生α相,使得β相组织细小;当Fe含量≥10%时,Fe出现了明显的富集。同时H元素导致β相向粗大化的方向发展,而且随Fe含量的增加,β相粗化越明显。HSPT合金的显微硬度高于真空烧结合金,尤其是α相的显微硬度随Fe含量的增加而线性增大。After cold isostatic pressing formation of HDH-Ti powder and carbonyl Fe powder as raw materials,Ti-xFe alloys(x=1%,5%,10%,15%,mass fraction)were prepared by vacuum sintering and hydrogen induced phase transformation sintering(HSPT).The density,phase,microstructure evolution and microhardness of the alloys in the two sintering processes were compared.The results show that the HSPT alloy contains more pores and the density is significantly lower than that of the vacuum sintered alloy.The content ofβphase in the two alloys increases with the increase of Fe content,and Ti Fe phase appears only in the Ti-15 Fe alloy prepared by HSPT.During the preparation of HSPT alloy,H has a significant inhibitory effect on the diffusion of Fe.When Fe content is no less than 5%,short rod-like or needle-like secondaryαphase is precipitated inside theβphase of the alloy after dehydrogenation,which makes theβphase structure fine.When Fe content reaches 10%or higher,significant enrichment of Fe appears.At the same time,H leads to coarseningof theβphase,and theβphase coarsening is more obvious with the increase of Fe content.The microhardness of HSPT alloy is higher than that of the vacuum sintered alloy,especially that ofαphase increases linearly with the increase of Fe content.

关 键 词：Ti-Fe合金 氢致相变烧结(HSPT) 真空烧结 组织演变 显微硬度 

分 类 号：TF12[冶金工程—粉末冶金] TG146.23[冶金工程—冶金物理化学]