Phase Field Modeling of Formation Mechanism of Grain Boundary Allotriomorph in β→α Phase Transformation in Ti-6Al-4V Alloy

doi:10.11900/0412.1961.2019.00392

Acta Metall Sin

2020, Vol. 56

Issue (8): 1113-1122 DOI: 10.11900/0412.1961.2019.00392

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Phase Field Modeling of Formation Mechanism of Grain Boundary Allotriomorph in β→α Phase Transformation in Ti-6Al-4V Alloy

SUN Jia¹^,², LI Xuexiong¹, ZHANG Jinhu¹, WANG Gang³, YANG Mei⁴, WANG Hao¹^,⁵, XU Dongsheng¹^,⁵(

)

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
4 School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China
5 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

SUN Jia, LI Xuexiong, ZHANG Jinhu, WANG Gang, YANG Mei, WANG Hao, XU Dongsheng. Phase Field Modeling of Formation Mechanism of Grain Boundary Allotriomorph in β→α Phase Transformation in Ti-6Al-4V Alloy. Acta Metall Sin, 2020, 56(8): 1113-1122.

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Abstract

The microstructure evolution with grain boundary wetting phase transformation of α allotriomorph during the β→α phase transformation in Ti-6Al-4V alloy has been investigated by means of phase field modeling. A realistic microstructure was generated by coupling the Thermo-Calc thermodynamic parameters and phase field evolution equations. It is shown that the specially constructed thermal noise terms disturb the β/β interfaces and can produce heterogeneous nucleation of α phase at energetically favorable points such as triple junctions and β grain boundaries (GBs). A small amount of α_GB (grain boundary α) nuclei formed at the early stage of phase transition would lead to the formation of discontinuous α_GB; while a large number of α_GB nuclei can result in the formation of continuous α_GB. GBs can be "wetted" by a second solid phase through the reversible transition from incomplete to complete solid state wetting at a certain temperature without a new reaction. The volume fraction of α phase and the grain number increased gradually as the noise amplitude increased from 0.05 to 0.11, or noise duration from 50 s to 80 s. Both noise amplitude and time could control the formation kinetics of α_GB, which will influence the microstructure, and the fatigue properties of Ti alloys can be altered if these are controlled experimentally.

Key words: Ti-6Al-4V phase field model thermal noise term α_GB grain boundary wetting

Received: 18 November 2019

ZTFLH:

TG146.22

Fund: National Key Research and Development Program of China(2016YFB0701304);Strategic Priority Research Program of Chinese Academy of Sciences(XDC01040100);Special Informatization Project of Chinese Academy of Sciences(XXH13506-304);National Natural Science Foundation of China(51671195)

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	Articles by authors
	Jia SUN
	Xuexiong LI
	Jinhu ZHANG
	Gang WANG
	Mei YANG
	Hao WANG
	Dongsheng XU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00392 OR https://www.ams.org.cn/EN/Y2020/V56/I8/1113

Parameter	Value	Unit
r	[-0.5,0.5]
ξ_noise	0.05, 0.07, 0.09, 0.11
t_noise	50，60，70，80	s
R	8.314	J·mol^-1·K^-1
T	1213	K
σ ω	0.0362 0.00036	J·m^-2
W	0.5×10^-6	m
a₁	$2 / 3$
κ	0.001814
M_ij L	1.0×10^-18 80
Δt	0.1	s
Δx	5×10^-8	m

Table 1 Simulation parameters in phase field model

Fig.1 Simulated microstructures at different time steps with thermal noise (The color scales in the corresponding figures represent the values of the order parameter, the same below)
Color online
(a) t=0 s (b) t=50 s (c) t=65 s (d) t=90 s

Fig.2 Simulation microstructure without thermal noise (a) and volume fractions of α with and without thermal noise (b)
Color online

Fig.3 Local zoomed-in view of microstructure in Fig.1d (a) and the corresponding concentration profiles of Al and V along the line AB (b)
Color online

Fig.4 Local zoomed-in view of microstructures of continuous α_GB under the condition ξ_noise=0.05 and t_noise=50 s at t=55 s (a), t=60 s (b), t=65 s (c), t=70 s (d), t=75 s (e) and t=80 s (f)
Color online

Fig.5 Local zoomed-in view of microstructures of incontinuous α_GB under the condition ξ_noise=0.05 and t_noise=50 s at t=55 s (a), t=60 s (b), t=65 s (c), t=70 s (d), t=75 s (e) and t=80 s (f)
Color online

Fig.6 Scheme showing the evolution from incomplete to complete grain boundary wetting phase transition caused by second solid phase

Fig.7 Simulation microstructure at ξ_noise=0.11 (a) and phase fractions of α when ξ_noise=0.05, 0.07, 0.09 and 0.11 (b) under the condition of t_noise=50 s
Color online

Fig.8 Simulation microstructure at t_noise=80 s (a) and phase fractions of α when t_noise=40, 50, 60, 70 and 80 s (b) when ξ_noise=0.05
Color online

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