Effect of Solution- and Aging-treatment on Microstructure and Microhardness of a Powder Metallurgy Ti-22Al-25Nb Alloy

doi:10.11901/1005.3093.2019.445

Chinese Journal of Materials Research

2020, Vol. 34

Issue (3): 198-208 DOI: 10.11901/1005.3093.2019.445

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Effect of Solution- and Aging-treatment on Microstructure and Microhardness of a Powder Metallurgy Ti-22Al-25Nb Alloy

JIA Jianbo¹,LU Chao¹,YANG Zhigang¹,DONG Tiantian¹,GU Yongfei¹,XU Yan^1,²(

)

1. Education Ministry Key Laboratory of Advanced Forging ＆ Stamping Technology and Science, Yanshan University, Qinhuangdao 066004, China
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China

Cite this article:

JIA Jianbo,LU Chao,YANG Zhigang,DONG Tiantian,GU Yongfei,XU Yan. Effect of Solution- and Aging-treatment on Microstructure and Microhardness of a Powder Metallurgy Ti-22Al-25Nb Alloy. Chinese Journal of Materials Research, 2020, 34(3): 198-208.

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Abstract

The powder metallurgy (P/M) Ti-22Al-25Nb (atomic fraction, %) alloy sintered by spark plasma sintering (SPS) at 950℃/80 MPa/10 min was used as the initial material and the alloy experienced the solution treatment at the temperature range of 940~1100℃ for 10~120 min and subsequently aged at 800℃/8 h. The effect of solution- and aging-treatment on the microstructure and microhardness of P/M Ti-22Al-25Nb alloy was investigated, while the model of microhardness evolution was proposed. The results show that the grain size and uniformity of B2 phase increase with the increase of solution temperature and holding time. The growth rate of B2 phase grain is the lowest in the temperature range of 940~1010℃, and the grain size uniformity reaches the maximum 0.84 at 1100℃. The size and number of secondary lath O-phase have a significant effect on the properties of the alloy. After aging in the (B2+O) two-phase region, with the increase in the volume fraction of the secondary lath O-phase and the decrease in the size of the laths, especially the increase in the number of intersecting and entangled O/O phases, the microhardness of the alloy was enhanced. The microhardness of the alloy reached the maximum value 434.92 HV after solution and aging treatment at 1060℃/60 min/water cooling (WC)+800℃/8 h/furnace cooling (FC).

Key words: metallic materials powder metallurgy Ti-22Al-25Nb alloy solution and aging treatment microstructure secondary O-phase microhardness microhardness evolution model

Received: 12 September 2019

ZTFLH:

TG146.2

Fund: Natural Science Foundation of Hebei Province(E2016203157)

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	Jianbo JIA
	Chao LU
	Zhigang YANG
	Tiantian DONG
	Yongfei GU
	Yan XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.445 OR https://www.cjmr.org/EN/Y2020/V34/I3/198

Table 1 Heat treatment of Ti-22Al-25Nb sintered alloy

Fig.1 SEM images and particle size distribution of prealloyed powders (a) low magnification, (b) high magnification, (c) particle size distribution

Fig.2 SEM micrographs of the original microstructure of the alloy before heat treatment (a) low magnification and (b) high magnification

Fig.3 SEM and OM micrographs of Ti-22Al-25Nb alloy at 1000℃/10-120 min/WC treatments (a) 1000℃/10 min/WC, (b) 1000℃/30 min/WC, (c) 1000℃/60 min/WC and (d) 1000℃/120 min/WC

Fig.4 Microstructures of Ti-22Al-25Nb alloy at 940~1030℃/60 min/WC treatment: (a) 940℃/60 min/WC, (b) 970℃/60 min/WC, (c) 1000℃/60 min/WC and (d) 1030℃/60 min/WC

Fig.5 Average grain size at different solution temperatures for 60 min holding time

Table 2 Average grain size of alloy after different solution treatments

Fig.6 Microstructures of Ti-22Al-25Nb alloy at 1000℃/10~120 min/WC+800℃/8 h/FC treatments (a, b) 1000℃/10 min/WC+800℃/8 h/FC, (c, d) 1000℃/30 min/WC+800℃/8 h/FC, (e, f) 1000℃/60 min/WC+800℃/8 h/FC, (g, h) 1000℃/120 min/WC+800℃/8 h/FC. (a, c, e, g) low magnification and (b, d, f, h) high magnification

Fig.7 SEM micrographs of Ti-22Al-25Nb alloy at 1100℃/10~120 min/WC + 800℃/8 h/FC treatments (a, b) 1100℃/10 min/WC+800℃/8 h/FC, (c, d) 1100℃/30 min/WC+800℃/8 h/FC, (e, f) 1100℃/60 min/WC+800℃/8 h/FC, (g, h) 1100℃/120 min/WC + 800℃/8 h/FC. (a, c, e, g) low magnification and (b, d, f, h) high magnification

Fig.8 B2 grain distribution histogram after 940~1100℃/60 min/WC + 800℃/8 h/FC treatments (a) 940℃, (b) 970℃, (c) 1000℃, (d) 1010℃, (e) 1030℃, (f) 1050℃, (g) 1060℃, (h) 1080℃ and (i) 1100℃

Table 3 Average grain size of alloy after different solution+aging treatments

Fig.9 Hardness of alloy after different solution time+800℃/8 h/FC aging treatment

Fig.10 Microhardness evolution model of solution+aging alloy (a) 940~1000℃, (b) 1010~1060℃ and (c) 1070~1100℃

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