Mechanical Properties of Ti-5Al-2.5Sn ELI Powder Compacts

doi:10.11901/1005.3093.2017.377

Chinese Journal of Materials Research

2018, Vol. 32

Issue (5): 333-340 DOI: 10.11901/1005.3093.2017.377

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Mechanical Properties of Ti-5Al-2.5Sn ELI Powder Compacts

Ruipeng GUO^1,², Jing ZHANG³, Lei XU¹(

), Jiafeng LEI¹, Yuyin LIU¹, Rui YANG¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3 Beijing Aerospace Propulsion Institute, Beijing 100076, China

Cite this article:

Ruipeng GUO, Jing ZHANG, Lei XU, Jiafeng LEI, Yuyin LIU, Rui YANG. Mechanical Properties of Ti-5Al-2.5Sn ELI Powder Compacts. Chinese Journal of Materials Research, 2018, 32(5): 333-340.

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Abstract

The Ti-5Al-2.5Sn with extra-low interstitial (ELI) powder compacts were fabricated by hot isostatic pressing (HIPing) via a pre-alloyed approach. The effect of powder pre-treatment and heat treatment of powder compacts on the microstructure and mechanical properties of Ti-5Al-2.5Sn ELI alloy are investigated. Results show that the best balance of oxygen content and fraction of hollow powder can be obtained for the powder with full size range. However, the particle size segregation of the pre-alloyed powder, which should be avoided during the powder filling, will degrade the tensile properties of the alloy at cryogenic temperature due to the gathering of gas bubble. The degassing temperature of titanium alloy-powder should be below the limitation of their service temperature, i.e. 400^oC in this study. When the powder compact is annealed at (α+β) phase region, the microstructure coarsens significantly and the thermal induced porosity will emerge due to the rapid growth and expansion of the residual micro-pores. The suggested annealing temperature of powder compact is below 800^oC. Finite element modeling (FEM) was used to predict the shrinkage of the encapsulated powder and optimize the tooling design. Based on FEM results, impellers of the Ti-5Al-2.5Sn ELI powder alloy have been successfully fabricated through HIPing route. The mechanical properties of powder metallurgy impeller are close to those of wrought materials.

Key words: metallic materials powder metallurgy hot isostatic pressing Ti-5Al-2.5Sn ELI alloy impeller structure finite element analysis

Received: 20 June 2017

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	Ruipeng GUO
	Jing ZHANG
	Lei XU
	Jiafeng LEI
	Yuyin LIU
	Rui YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.377 OR https://www.cjmr.org/EN/Y2018/V32/I5/333

Fig.1 Particle size distribution (a) of Ti-5Al-2.5Sn ELI powder and frequency of hollow powder and oxygen contents (b) under different particle size fractions

Fig.2 Microstructure (a) and Micro-CT image (b) of Ti-5Al-2.5Sn ELI alloy HIPed from powder with full size range

Fig.3 Particle size distributions of Ti-5Al-2.5Sn ELI powder at different positions of the container

Fig.4 Schematic of a typical tooling design

Table 1 Tensile properties of Ti-5Al-2.5Sn ELI powder compact after long-term powder filling

Fig.5 Fracture surfaces of HIPed Ti-5Al-2.5Sn ELI alloy at the top of the container: (a) δ=20% and (b) δ=10.5%

Fig.6 Infrared spectrums of Ti-5Al-2.5Sn ELI powders during heated process

Fig.7 XRD pattern of corrosion products of mild steel in air for 30 days (temperature 18~25℃, humidity 50%~70%)

Table 2 Comparison of room temperature tensile properties of Ti-5Al-2.5Sn ELI alloy HIPed from degassed and non-degassed powders

Fig.8 OM images of Ti-5Al-2.5Sn ELI powder compacts annealed at 800℃ (a), 900℃ (b) and 1000℃ (c)

Fig.9 The predicted shrinkage of 2D symmetric sections: (a) before HIPing and (b) after HIPing

Fig.10 Picture of PM Ti-5Al-2.5Sn ELI impeller

Table 3 Dimensional comparison of impeller at several critical locations

Table 4 Mechanical properties of Ti-5Al-2.5Sn ELI alloy

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