Neutron Diffraction and Neutron Radiography Investigation into Powder Sintering of Ti/Al and TiH2/Al Compacts

Gang Chen; Klaus Dieter Liss; Peng Cao; Xin Lu; Xuanhui Qu

doi:10.1007/s11663-018-1470-x

Neutron Diffraction and Neutron Radiography Investigation into Powder Sintering of Ti/Al and TiH₂/Al Compacts

Gang Chen, Klaus Dieter Liss, Peng Cao, Xin Lu, Xuanhui Qu

Research output: Contribution to journal › Article › peer-review

Abstract

Sintering behaviors of two types of powder compact, i.e., Ti/Al and TiH₂/Al, under vacuum were studied using in situ neutron diffraction, in situ thermal dilatometric measurement, and ex situ neutron radiography. Their densification, microstructure, hydrogen concentration, and phase transformation features were compared. The results indicate that the predominant phase identified in the samples sintered from both compacts is γ-TiAl phase with minor Ti₃Al phase. Dehydrogenation of TiH₂ plays a decisive role in the sintering behavior and the resultant microstructure. In comparison with the Ti/Al compact, dehydrogenation occurring in the TiH₂/Al compact leads to a higher level of densification and faster sintering kinetics.

Original language	English
Pages (from-to)	429-437
Number of pages	9
Journal	Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume	50
Issue number	1
DOIs	https://doi.org/10.1007/s11663-018-1470-x
Publication status	Published - 2019 Feb 15
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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Neutron Diffraction and Neutron Radiography Investigation into Powder Sintering of Ti/Al and TiH₂/Al Compacts. / Chen, Gang; Liss, Klaus Dieter; Cao, Peng; Lu, Xin; Qu, Xuanhui.

In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 50, No. 1, 15.02.2019, p. 429-437.

Research output: Contribution to journal › Article › peer-review

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AU - Qu, Xuanhui

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AB - Sintering behaviors of two types of powder compact, i.e., Ti/Al and TiH2/Al, under vacuum were studied using in situ neutron diffraction, in situ thermal dilatometric measurement, and ex situ neutron radiography. Their densification, microstructure, hydrogen concentration, and phase transformation features were compared. The results indicate that the predominant phase identified in the samples sintered from both compacts is γ-TiAl phase with minor Ti3Al phase. Dehydrogenation of TiH2 plays a decisive role in the sintering behavior and the resultant microstructure. In comparison with the Ti/Al compact, dehydrogenation occurring in the TiH2/Al compact leads to a higher level of densification and faster sintering kinetics.

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