Preparation and Microstructure Characterization of#br# High Temperature Micro-laminated Materials of Ti2AlNb Alloy Powder and Ti/Al Nano-multilayer Foil by Hot-pressed Sintering

doi:10.3901/JME.2017.06.073

Abstract

Abstract:

The aim of this paper is to explore the development of new titanium-based alloy with operating temperature of 700-750 ℃ and with good room temperature plasticity . Fabrication of high temperature micro-laminated Ti-Al intermetallic composites materials (TiAl+Ti₂AlNb) by hot-pressed sintering of mixed Ti/Al nano-multilayer foil and Ti₂AlNb alloy powder is studied at 1473 K under a pressure of 30 MPa for 1.5 h. The exothermic reaction of Ti/Al nano-multilayer foil during the hot pressing process promotes the densification of the samples. The phase constituent and microstructures of hot-pressed sintering products are subsequently analyzed by X-ray diffraction(XRD), scanning electron microscope(SEM) and energy dispersive spectroscopy(EDS). Additionally the micro-hardness of some typical microzones is also measured. Similarity exists in the phase distribution for the sintering products. Different types of diffusion reactions occurred within the sintered body during hot-pressed sintering, finally leading to the formation of graded microstructures, Ti₂AlNb/Ti₂Al(Nb)/TiAl. Hot-pressed sintering sample with the Ti₂AlNb powder with broken Ti/Al foil shows different hardness in different microzones. The largest hardness (605.85 HV) appears in the reaction formed TiAl(Nb) phase with the Ti∶Al∶Nb ratio of 1∶1∶1, whereas the TiAl phase formed from Ti/Al nano-multilayer material shows the lowest hardness (251.11 HV).

Key words: hardness, hot-press sintering, microstructure, Ti/Al nano-multilayer foil, Ti2AlNb alloy, high temperature micro-laminated materials

FANG Shuang, XIONG Huaping, CHENG Yaoyong, LIN Hai, YU Qiuying, REN Xinyu, WANG Shuyun. Preparation and Microstructure Characterization of#br# High Temperature Micro-laminated Materials of Ti₂AlNb Alloy Powder and Ti/Al Nano-multilayer Foil by Hot-pressed Sintering[J]. Journal of Mechanical Engineering, 2017, 53(6): 73-79.

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Preparation and Microstructure Characterization of#br# High Temperature Micro-laminated Materials of Ti₂AlNb Alloy Powder and Ti/Al Nano-multilayer Foil by Hot-pressed Sintering

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