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Article

Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure

1
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
2
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(8), 1058; https://doi.org/10.3390/met10081058
Received: 9 July 2020 / Revised: 30 July 2020 / Accepted: 31 July 2020 / Published: 6 August 2020
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Titanium Alloys)
The roles of microstructure in plastic deformation and crack growth mechanisms of a titanium alloy with a trimodal microstructure have been systematically investigated. The results show that thick intragranular α lath and a small number of equiaxed α phases avoid the nucleation of cracks at the grain boundary, resulting in branching and fluctuation of cracks. Based on electron back-scattered diffraction, the strain partition and plastic deformation ahead of the crack tip were observed and analyzed in detail. Due to the toughening effect of the softer equiaxed α phase at the grain boundary, crack arresting and blunting are prevalent, improving the crack growth resistance and generating a relatively superior fracture toughness performance. These results indicate that a small amount of large globular α phases is beneficial to increase the crack propagation resistance and, thus, a good combination of mechanical property is obtained in the trimodal microstructure. View Full-Text
Keywords: titanium alloy; trimodal microstructures; strain partition; crack propagation titanium alloy; trimodal microstructures; strain partition; crack propagation
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MDPI and ACS Style

Tan, C.; Fan, Y.; Sun, Q.; Zhang, G. Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure. Metals 2020, 10, 1058. https://doi.org/10.3390/met10081058

AMA Style

Tan C, Fan Y, Sun Q, Zhang G. Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure. Metals. 2020; 10(8):1058. https://doi.org/10.3390/met10081058

Chicago/Turabian Style

Tan, Changsheng, Yiduo Fan, Qiaoyan Sun, and Guojun Zhang. 2020. "Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure" Metals 10, no. 8: 1058. https://doi.org/10.3390/met10081058

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