Primary Creep and Steady-State Creep of Ti65 Alloy

doi:10.11901/1005.3093.2019.286

Chinese Journal of Materials Research

2020, Vol. 34

Issue (2): 151-160 DOI: 10.11901/1005.3093.2019.286

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Primary Creep and Steady-State Creep of Ti65 Alloy

YUE Ke^1,²,LIU Jianrong¹(

),YANG Rui¹,WANG Qingjiang¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

YUE Ke, LIU Jianrong, YANG Rui, WANG Qingjiang. Primary Creep and Steady-State Creep of Ti65 Alloy. Chinese Journal of Materials Research, 2020, 34(2): 151-160.

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Abstract

The creep deformation behavior and relevant microscopic deformation mechanisms of Ti65 alloy were investigated via tensile creep test by stresses in the range of 120~160 MPa at 600~650^oC and TEM observation. The results show that the primary creep deformation mechanism is dominated by the process of climbing-controlled dislocations crossing the α₂ phases and the creep mechanism in the steady-state creep stage is dominated by the process of diffusion-controlled dislocation climbing at the α/β interfaces, and the stress index of steady-state creep stage varies from 5 to 7. The hindering of dislocation motions by α₂ phases is the dominating process to strengthen the high-temperature creep resistance of Ti65 alloy during the primary creep stage. The silicide precipitates distributed along α/β phase boundaries, impede the dislocation motions and restrict the grain boundary slip (GBS), which is the dominating strengthening mechanism during the steady-state creep stage.

Key words: microstructure and properties of materials creep deformation creep test Ti65 alloy

Received: 03 June 2019

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TG142.25

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	YUE Ke
	LIU Jianrong
	YANG Rui
	WANG Qingjiang

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.286 OR https://www.cjmr.org/EN/Y2020/V34/I2/151

Fig.1 Microstructure of Ti65 alloy before tensile creep (a) SEM image; (b) TEM bright field image

Fig.2 Geometric dimensions of creep test specimen (unit：mm)

Fig.3 A typical creep strain-time curve

Fig.4 Strain-time curves for creep of Ti65 alloy with different applied stresses at (a) 600℃, (b) 630℃, and (c) 650℃

Table 1 Numerical fitting results of creep curves under different conditions (creep stages I and II)

Table 2 Statistics of creep strains and steady-state creep rates

Fig.5 Relationships of steady-state creep strain (?_s), creep strains, and time at the onset of creep stage II (t_os) with test temperature, and applied stresses. The values of ?_s and t_os refer to the right Y-axis

Fig.6 Compensated steady-state strain rates versus mo-dulus compensated steady-state stress for creep behavior of Ti65 alloy

Fig.7 TEM images of crept samples at (a) 600℃/160 MPa, (b) 650℃/160 MPa. The residual β phase in colonies partially dissolved and the silicides coarsened significantly after creep deformation

Fig.8 Dislocation configurations of crept specimens under different conditions (a) 600℃/120 MPa, (b) 600℃/140 MPa, (c) 600℃/160 MPa, (d) 630℃/120 MPa, (e) 630℃/140 MPa, (f) 630℃/160 MPa, (g) 650℃/120 MPa, (h) 650℃/140 MPa, (i) 650℃/120 MPa

Fig.9 Dislocation configurations of Ti65 alloy at 650℃ with the applied stress 160 MPa after creep for (a) 200 h, and (b) 1000 h

Fig.10 Interactions of silicides and dislocations. (a) 600℃/160 MPa, (b) 630℃/160 MPa, and (c) 650℃/120 MPa

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