Preparation of γ-TiAl Alloy From Powder Metallurgy Route and Analysis of the Influence Factors of Mechanical Properties

doi:10.11901/1005.3093.2014.377

Chinese Journal of Materials Research

2015, Vol. 29

Issue (2): 127-134 DOI: 10.11901/1005.3093.2014.377

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Preparation of γ-TiAl Alloy From Powder Metallurgy Route and Analysis of the Influence Factors of Mechanical Properties

Jie WU¹,Lei XU^1,^**(

),Ruipeng GUO^1,²,Zhengguan LU¹,Yuyou CUI¹,Rui YANG¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

Cite this article:

Jie WU,Lei XU,Ruipeng GUO,Zhengguan LU,Yuyou CUI,Rui YANG. Preparation of γ-TiAl Alloy From Powder Metallurgy Route and Analysis of the Influence Factors of Mechanical Properties. Chinese Journal of Materials Research, 2015, 29(2): 127-134.

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Abstract

Pre-alloyed powders of Ti-47Al-2Cr-2Nb-0.15B (%, atom fraction) were prepared by an electrode induction melting gas atomization process, and powder metallurgy (PM) γ-TiAl alloys were prepared by hot isostatic press (HIP). Pre-alloyed powders of γ-TiAl were characterized. A comparison study was made between vacuum degassed and not degassed for the pre-alloyed powders and the PM alloys were subjected to tensile and rupture life test at different temperatures. Infrared spectrum analysis showed that the powders would absorb H₂O when exposed in air. By getting rid of the absorbed H₂O and O₂ through a carefully designed vacuum degassing pre-treatment, the numbers of voids in the prepared PM γ-TiAl alloys decreased obviously, correspondingly the rupture life, as well as the consistency of room temperature tensile elongation, was also improved. In order to find out the influence of container materials on the microstructure and mechanical properties of the PM γ-TiAl alloys, two different container materials (CP-Ti and mild steel) were adopted. Experimental results showed that a lot of obvious voids appeared in the reaction zone due to severe reaction diffusion between the mild steel container and the PM γ-TiAl alloys when HIPed at 1260^oC. The shielding effect of the mild steel container was stronger than that of the CP-Ti container, thus the densification shrinkage process of the CP-Ti canned PM γ-TiAl alloys would be more fully completed when HIPed at 1230^oC compared with that of the mild steel canned PM γ-TiAl alloys, and thereby both of the yield and tensile strength were both improved. The γ-TiAl alloys prepared by powder metallurgy route present more uniform microstructure, finer grain and better properties compared with the casting alloys. Furthermore, the PM γ-TiAl alloys had no texture which was very common for the casting alloys.

Key words: metallic materials, powder metallurgy, γ-TiAl, pre-treatment, container material

Received: 24 July 2014

Fund: *Supported by National High Technology Research and Development Program of China No.2013AA031606.

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	Jie WU
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	Ruipeng GUO
	Zhengguan LU
	Yuyou CUI
	Rui YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.377 OR https://www.cjmr.org/EN/Y2015/V29/I2/127

Fig.1 Differential size distribution of γ-TiAl pre-alloyed powder

Fig.2 Surface SEM image of γ-TiAl pre-alloyed powder

Fig.3 Infrared spectrums of pre-alloyed powders (≤50 μm), held for 3h in humid environment (RH=60%) (a) Ti-6Al-4V powder, (b) γ-TiAl powder

Fig.4 Room temperature elongation frequency distribution of PM γ-TiAl alloys

Table 1 650^oC rupture life contrast of PM γ-TiAl alloy through different pre-treatment routes

Fig.5 Void size distribution histogram calculated for both degassed and not degassed samples calculated by tomographic analysis

Fig.6 SEM-BSE reacting layer between contanier and PM γ-TiAl alloy (a) mild steel contanier/γ-TiAl HIPed at 1230^oC, (b) mild steel contanier/γ-TiAl HIPed at 1260^oC, (c) the microstructure in PM γ-TiAl alloy when HIPed at 1260^oC (mild steel), (d) CP-Ti contanier/γ-TiAl HIPed at 1260^oC

Fig.7 Tomographic reconstructed voids in PM γ-TiAl samples HIPed at 1230^oC/140 MPa/3 h (a) mild steel container (b) CP-Ti container (c) void size distribution histogram of PM γ-TiAl for both mild steel and CP-Ti containers obtained from tomographic analysis

Table 2 Typical tensile properties of typical P/M TiAl alloys

Fig.8 Flow stress-temperature curve of γ-TiAl alloy and different container material

Table 3 Typical tensile properties of cast and PM γ-TiAl alloys

Fig.9 Microstructure of γ-TiAl alloy (a) γ phase IPF map of cast γ-TiAl alloy (b) (111) and <110> pole figures of γ phase of cast γ-TiAl alloy (c) γ phase IPF map of PM γ-TiAl alloy (d) (111) and <110> pole figures of γ phase of PM γ-TiAl alloy

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