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Open AccessArticle

Microstructure and Mechanical Properties of Ti6Al4V Alloy Consolidated by Different Sintering Techniques

1
Institute of Materials Science, Vietnam Academy of Science and Technology, 10072 Hanoi, Vietnam
2
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 10072 Hanoi, Vietnam
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1033; https://doi.org/10.3390/met9101033
Received: 13 August 2019 / Revised: 2 September 2019 / Accepted: 21 September 2019 / Published: 23 September 2019
(This article belongs to the Special Issue Powder Metallurgy of Titanium Alloys)
In this paper, we investigated the effect of the different sintering techniques including vacuum sintering, capsule-free hot isostatic pressing (HIP), and capsule HIP on the microstructure and mechanical properties of Ti6Al4V alloy. The obtained results indicated that full density Ti6Al4V alloy could be obtained by using capsule HIP technique. The alloy sintered by capsule HIP had the highest hardness (~405 HV) and compressive yield strength (~1056 MPa). It is interesting that the geometry has a significant influence on the relative density and mechanical properties of the alloy sintered by the capsule-free HIP. The relative density, hardness, and compressive yield strength rise from center to periphery of the specimen. This is attributed to the heating and pressing in the capsule-free, which are external, leading to the densification processes starting from the outside to the inner parts of the pressed specimen. Using theoretical prediction with Gibson and Ashby power law found that the yield strength of the alloy sintered by capsule-HIP technique is much lower than that of the calculated value due to the formation of the coarse lamellar microstructure of α-Ti grains. View Full-Text
Keywords: sintering; hot isostatic pressing; Ti6Al4V and microstructure; mechanical properties sintering; hot isostatic pressing; Ti6Al4V and microstructure; mechanical properties
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Dinh Phuong, D.; Van Duong, L.; Van Luan, N.; Ngoc Anh, N.; Van Trinh, P. Microstructure and Mechanical Properties of Ti6Al4V Alloy Consolidated by Different Sintering Techniques. Metals 2019, 9, 1033.

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