Effect of Temperature and Powder Particle Size on Mechanical Properties and Microstructure of PM Ti2AlNb Alloy Prepared via Hot Isostatic Pressing

doi:10.11901/1005.3093.2018.509

Chinese Journal of Materials Research

2019, Vol. 33

Issue (3): 161-169 DOI: 10.11901/1005.3093.2018.509

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Effect of Temperature and Powder Particle Size on Mechanical Properties and Microstructure of PM Ti₂AlNb Alloy Prepared via Hot Isostatic Pressing

Qiaomu LIU¹,Jie WU²,Yulong CHEN¹,Qianming CHEN¹,Huiping PEI¹,Lei XU²(

)

1. AECC Sichuan Gas Turbine Establishment, Chengdu 610500, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Qiaomu LIU,Jie WU,Yulong CHEN,Qianming CHEN,Huiping PEI,Lei XU. Effect of Temperature and Powder Particle Size on Mechanical Properties and Microstructure of PM Ti₂AlNb Alloy Prepared via Hot Isostatic Pressing. Chinese Journal of Materials Research, 2019, 33(3): 161-169.

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Abstract

Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo (atomic fraction, %) was prepared via a two step process, i.e. electrode no crucible induction melting and then gas atomization process. Powder metallurgy (PM) Ti₂AlNb alloys was prepared through a typical hot isostatic pressing (HIPing) route. Two pre-alloyed powders with average particle sizes of 70 and 200 μm respectively were prepared and adopted to prepare PM alloys tested for comparison. The results showed that the powder particle size had no significant effect on the tensile strength at room temperature, but a significant effect on the tensile strength and rupture life time at elevated temperature. It showed that the rupture lifetime of PM Ti₂AlNb alloys made of the coarser powders was about 40% less than that of the finer powders.

Key words: metallic materials hot isostatic pressing powder particle size Ti₂AlNb mechanical properties

Received: 15 August 2018

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	Qiaomu LIU
	Jie WU
	Yulong CHEN
	Qianming CHEN
	Huiping PEI
	Lei XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.509 OR https://www.cjmr.org/EN/Y2019/V33/I3/161

Table 1 Chemical composition of Ti₂AlNb pre-alloyed powders (mass fraction, %)

Fig.2 Typical morphology of Ti₂AlNb pre-alloyed powders

Fig.4 Microstructure of PM Ti₂AlNb alloy after HIPing at (a) 920℃/130 MPa/3 h, (b) 980℃/140 MPa/3 h, (c) 1010℃/140 MPa/3 h, (d) 1030^oC/140 MPa/3 h, (e) 1080℃/140 MPa/3 h, (f) 1165℃/140 MPa/3 h. PPB refers to previous particle boundary

Fig.5 Microstructure of PM Ti₂AlNb (hipped at 1030℃/140 MPa/3 h) alloy by EBSD analysis

Table 2 Tensile and rupture properties at room and elevated temperature of PM Ti₂AlNb alloys with different original particle size

Fig.8 Tomographic reconstructed in Ti₂AlNb hot isostatic pressing samples at 1030℃/140 MPa/3 h: (a) D₅₀=70 μm, (b) D₅₀=200 μm, (c) void size distribution histogram of Ti₂AlNb samples for both D₅₀=70 μm and D₅₀=200 μm obtained from tomographic analysis

Fig.9 Ti₂AlNb complex parts prepared from powder metallurgy route

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