Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation

Chen, Wei; Li, Chao; Feng, Kangtun; Lin, Yongcheng; Zhang, Xiaoyong; Chen, Chao; Zhou, Kechao

doi:10.3390/ma13194255

Open AccessArticle

Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation

by

Wei Chen

¹,

Chao Li

²,

Kangtun Feng

³,

Yongcheng Lin

⁴

,

Xiaoyong Zhang

^1,*,

Chao Chen

¹

and

Kechao Zhou

¹

State Key Laboratory of Powder Metallurgy, Central South University, Lu Mountain South Road, Changsha 410083, China

²

Hunan Goldsky Titanium Industry Technology Co., Ltd., No. 97, Qianming Road, Deshan Town, Changde ECO-TECH Development Zone, Changsha 410205, China

³

AVIC Landing Gear Manufacturing Corporation, Changsha 410083, China

⁴

School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

^*

Author to whom correspondence should be addressed.

Materials 2020, 13(19), 4255; https://doi.org/10.3390/ma13194255

Submission received: 7 September 2020 / Revised: 21 September 2020 / Accepted: 21 September 2020 / Published: 24 September 2020

(This article belongs to the Collection Alloy and Process Development of Light Metals)

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Abstract

Near β-Ti alloys with high strength and good ductility are desirable for application in aviation and aerospace industries. Nevertheless, strength and ductility are usually mutually exclusive in structural materials. Here we report a new thermo-mechanical process, that is, the alloy was cross-rolled in β field then aged at 600 °C for 1 h. By such a process, a high strength (ultimate tensile strength: 1480 MPa) and acceptable ductility (elongation: 10%) can be simultaneously achieved in the near β-Ti alloy, based on the microscale β matrix and nanoscale α phase. The microstructure evolution, mechanical properties and strengthening mechanisms have been clarified by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the grain size of the β phase progressively decreased with the increasing of rolling reduction. Moreover, dense dislocation structures and martensite phases distributed in the cross-rolled β matrix can effectively promote the precipitation of nanoscale α particles. TEM analyses confirmed that a heat-treatment twin was generated in the newly formed α lath during aging. These findings provide insights towards developing Ti alloys with optimized mechanical properties.

Keywords: near β-Ti alloy; cross-rolled; thermo-mechanical process; microstructure evolution; strengthening mechanism

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MDPI and ACS Style

Chen, W.; Li, C.; Feng, K.; Lin, Y.; Zhang, X.; Chen, C.; Zhou, K. Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation. Materials 2020, 13, 4255. https://doi.org/10.3390/ma13194255

AMA Style

Chen W, Li C, Feng K, Lin Y, Zhang X, Chen C, Zhou K. Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation. Materials. 2020; 13(19):4255. https://doi.org/10.3390/ma13194255

Chicago/Turabian Style

Chen, Wei, Chao Li, Kangtun Feng, Yongcheng Lin, Xiaoyong Zhang, Chao Chen, and Kechao Zhou. 2020. "Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation" Materials 13, no. 19: 4255. https://doi.org/10.3390/ma13194255

APA Style

Chen, W., Li, C., Feng, K., Lin, Y., Zhang, X., Chen, C., & Zhou, K. (2020). Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation. Materials, 13(19), 4255. https://doi.org/10.3390/ma13194255

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Strengthening of a Near β-Ti Alloy through β Grain Refinement and Stress-Induced α Precipitation

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