Preparation and Compressive Property of Single-crystal Titanium Made by Multi-stage Annealing Treatment

doi:10.11901/1005.3093.2016.510

Chinese Journal of Materials Research

2017, Vol. 31

Issue (7): 547-552 DOI: 10.11901/1005.3093.2016.510

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Preparation and Compressive Property of Single-crystal Titanium Made by Multi-stage Annealing Treatment

Xiguang DENG¹(

), Songxiao HUI², Wenjun YE², Xiaoyun SONG²

1 Shenyang Aircraft Industry (Group) Co., Ltd., Shenyang 110034, China
2 State Key Laboratory of Non-ferrous Metals and Processing, General Research Institute for Non-ferrous Metals, Beijing 100088, China

Cite this article:

Xiguang DENG, Songxiao HUI, Wenjun YE, Xiaoyun SONG. Preparation and Compressive Property of Single-crystal Titanium Made by Multi-stage Annealing Treatment. Chinese Journal of Materials Research, 2017, 31(7): 547-552.

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Abstract

Poly-crystal Ti with grain size larger than 12 mm was prepared through multi-stage heat treatment. Among which, the first stage of long time anneal at 860℃ could facilitate the grain growth of the original α phase, therewith reduced the total grain boundary area as a result; Meanwhile, low heating rate of 0.1℃/min in the second and low cooling rate of 0.1℃/min in the fourth stage were adopted to ensure the titanium slowly passing through the phase transformation point at 883℃ in order to restrain the number of nucleation. The orientation of hexagonal close packed (HCP) unit cell was constructed according to the Euler angle detected by electron backscatter diffraction (EBSD), and single-crystal compressive specimen was prepared for mechanical test and scanning electron microscope (SEM) observation. Slip band of $11 2 ? 3 11 2 ? 2$ type was determined, and the obvious influence of the grain orientation on mechanical behavior was analyzed by Schmid factor.

Key words: metallic materials non-ferrous alloy single-crystal titanium multi-stage annealing Schmid factor

Received: 30 August 2016

ZTFLH:

TG146.2

Fund: Supported by National Natural Science Foundation of Cina (No. 51601016)

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	Xiguang DENG
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	Xiaoyun SONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.510 OR https://www.cjmr.org/EN/Y2017/V31/I7/547

Fig.1 Crystallographic orientation map of the as-received material

Fig.2 (0001) pole figure of the original structure

Fig.3 Schematic of multi-step annealing treatment

Fig.4 Schematic of the fixture with extensometer

Fig.5 EBSD test result and lattice orientation of single-crystal titanium derived from Euler angles of (158° 89° 249°)

Fig.6 Cuboid-shaped single-crystal specimen and the true stress strain curve

Fig.7 SEM images of slip band on the surface

Fig.8 Two

11 2 ? 3 11 2 ? 2

slip systems and the corresponding slip bands

Table 1 Calculated Schmid factor of six

11 2 ? 3 11 2 ? 2

slip systems

Fig.9 Stress and strain curve of cylindrical single-crystal titanium specimen

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