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闫志巧,陈峰,许荣君,刘咏,刘彬.真空烧结和氢致相变烧结制备Ti-xFe合金的组织演变过程和性能研究[J].稀有金属材料与工程(英文),2020,49(3):1031~1037.[Yan Zhiqiao,Chen Feng,Xu Rongjun,Liu Yong and Liu Bin.Microstructure evolution and properties of Ti-xFe alloys prepared by vacuum sintering and hydrogen induced phase transformation sintering[J].Rare Metal Materials and Engineering,2020,49(3):1031~1037.]
Microstructure evolution and properties of Ti-xFe alloys prepared by vacuum sintering and hydrogen induced phase transformation sintering
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Received:January 16, 2019  Revised:July 25, 2019
DOI:
Key words: Ti-Fe alloys  hydrogen induced phase transformation sintering (HSPT)  vacuum sintering  microstructure evolution  microhardness
Foundation item: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)
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Yan Zhiqiao,Chen Feng,Xu Rongjun,Liu Yong and Liu Bin  
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Abstract:
      With HDH-Ti powder and carbonyl Fe powder as raw materials and formed by cold isostatic pressing, Ti-xFe alloys (x=1%, 5%, 10% and 15wt%) were prepared by vacuum sintering and hydrogen induced phase transformation sintering (HSPT), respectively. 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 of β phase in the two alloys increases with the increase of Fe content, and TiFe phase appears only in the Ti-15Fe 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 than5%, short rod-like or needle-like secondary α phase is precipitated inside the β phase of the alloy after dehydrogenation, which makes the β phase structure fine. When Fe content reaches 10% or higher, Fe appears significant enrichment. At the same time, H leads to the development of the β phase growing coarsening, and the β phase 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 of α phase increases linearly with the increase of Fe content.