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

• Published in: Metals (Basel ) Vol. 9; no. 10; p. 1033
• Main Authors: Dinh Phuong, Doan, Van Duong, Luong, Van Luan, Nguyen, Ngoc Anh, Nguyen, Van Trinh, Pham
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-10-2019
• Subjects: Compressive strength; Densification; Density; Hardness; Hot isostatic pressing; Mechanical properties; Microstructure; Particle size; Plasma sintering; Pore size; Powder metallurgy; Scanning electron microscopy; sintering; Ti6Al4V and microstructure; Titanium alloys; Titanium base alloys; Vacuum sintering; Yield strength; Japan
• ISSN: 2075-4701; 2075-4701
• DOI: 10.3390/met9101033

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.