Typical Microstructural Characteristics of Ti-5Al-5Mo-5V-3Cr-1Fe Metastable β Ti Alloy Forged in α+β Region

doi:10.1007/s40195-020-01115-y

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (12): 1601-1608.DOI: 10.1007/s40195-020-01115-y

收稿日期:2020-02-25 修回日期:2020-04-23 接受日期:2020-05-24 出版日期:2020-12-10 发布日期:2020-12-11

Typical Microstructural Characteristics of Ti-5Al-5Mo-5V-3Cr-1Fe Metastable β Ti Alloy Forged in α+β Region

Zhiying Zheng¹, Linjiang Chai¹(), Kang Xiang¹, Weijiu Huang²(), Yongfeng Wang³, Liangliang Liu³, Lin Tian³

¹College of Materials Science and Engineering, Chongqing University of Technology, Chongqing, 400054, China
²College of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, China
³Chongqing Kingsley Aeronautical Material Technology Co. Ltd, Chongqing, 404100, China

Received:2020-02-25 Revised:2020-04-23 Accepted:2020-05-24 Online:2020-12-10 Published:2020-12-11
Contact: Linjiang Chai,Weijiu Huang

摘要/Abstract

Abstract:

In this study, typical microstructural characteristics of a metastable β Ti alloy (Ti-5Al-5Mo-5V-3Cr-1Fe) forged in a dual-phase region (strain of 54% at 820 °C) were investigated in detail by the combined use of X-ray diffraction, energy dispersive spectroscopy, electron channeling contrast imaging and electron backscatter diffraction techniques. Results show that the microstructure of the forged alloy is composed of bulk α grains, α plates and β matrix. The bulk α grains correspond to retained primary α phase (α_p, average grain size~2.4 μm), while the α plates are secondary α phase (α_s, width~70 nm) precipitated from the β matrix during air cooling. During forging, the β matrix experiences dynamic recovery with many subgrains and significant orientation gradients formed. Analyses of the orientation relationship between the α and β phases show that the Burgers orientation relationship is not maintained between some α_p and β phases, which should be related to thermal deformation-induced changes of their orientations. In contrast, all of the α_s plates are found to maintain well the Burgers orientation relationship with the β phase.

Key words: Metastable β Ti alloy, α+β forging, Dynamic recovery, Orientation relationship, Electron backscatter diffraction (EBSD)

. [J]. 金属学报英文版, 2020, 33(12): 1601-1608.

Zhiying Zheng, Linjiang Chai, Kang Xiang, Weijiu Huang, Yongfeng Wang, Liangliang Liu, Lin Tian. Typical Microstructural Characteristics of Ti-5Al-5Mo-5V-3Cr-1Fe Metastable β Ti Alloy Forged in α+β Region[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(12): 1601-1608.

图/表 10

Table 1 Chemical composition of the experimental material (wt%)

Al	Mo	V	Cr	Fe	Zr	O	Ti
5.47	5.20	5.11	2.89	1.12	0.18	0.12	Bal.

Fig. 1 Schematic of the specimen cut from the as-received materialFull size image

Fig. 2 XRD pattern of the as-forged specimen

Fig. 3 ECC images of the as-forged specimen: a a low-magnification observation; b, c significantly magnified images corresponding to the boxed regions in a, b, respectively; d, e EDS results of P1 and P2 in c, respectively

Fig. 4 EBSD-revealed microstructural characteristics of the as-forged specimen: a BC, b IPF maps with black lines indicating interfaces between α and β phases. Insets in b are color codes for grain orientations of both phases, respectively

Fig. 5 EBSD analyses for the β matrix (extracted from Fig. 4): a IPF map with black and gray lines representing grain boundaries with θ>15° and 2°<θ≤15°, respectively; b KAM map; c misorientation angle distribution histogram corresponding to a; d misorientation angle distributions along the arrowed path in a. The color code in Fig. 5a is the same as that in Fig. 4b

Fig. 6 EBSD analyses for the α phase (extracted from Fig. 4): a IPF map; b KAM map; c misorientation angle distribution histogram corresponding to a; d rotation axis distribution corresponding to specific misorientation angle in c. The color code in Fig. 6a is the same as that in Fig. 4b

Fig. 7 EBSD analyses for only bulk α grains (extracted from Fig. 4): a IPF map, b misorientation angle distribution histogram corresponding to a

Fig. 8 Relationships between αp and β phases: a, b corresponding to regions A and B boxed in Fig. 4b, respectively; c, e pole figures of β and α phases in a, respectively; d, f pole figures of β and α phases in b, respectively

Table 2 Fractions of LABs and HABs in the β matrix with θ<2° excluded

Boundary type	Fraction (%)
LABs	87.8
HABs	12.2

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Typical Microstructural Characteristics of Ti-5Al-5Mo-5V-3Cr-1Fe Metastable β Ti Alloy Forged in α+β Region

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