Effect of initial microstructure on the micromechanical behavior of Ti-55531 titanium alloy investigated by in-situ high-energy X-ray diffraction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yimin Cui
  • Chaohua Li
  • Changsheng Zhang
  • Runguang Li
  • Weiwei Zheng
  • Yandong Wang

Detail(s)

Original languageEnglish
Article number138806
Journal / PublicationMaterials Science and Engineering A
Volume772
Online published10 Dec 2019
Publication statusPublished - 20 Jan 2020
Externally publishedYes

Abstract

Microstructure features including the morphology and texture of constituent phases play an important role in the mechanical properties of Ti-55531 high strength titanium alloy. However, the underlying understanding from the micromechanical aspect is still lacking. In the present work, the effect of microstructure on the micromechanical behavior of Ti-55531 alloy was investigated by high-energy X-ray diffraction. For two typical microstructures of Ti-55531 alloy, the micromechanical behavior including lattice strains of oriented grains are determined. Furthermore, the stress partitioning between α and β phase and internal microstress evolution in the specimens with different microstructures are discussed. In combination with the microstructure characterization, the corresponding mechanism for microstructure influence on the mechanical properties is discussed. It is found that, for the specimens with different types of microstructures, stress partitioning between constituent phases is obviously different. The results show that the α phase stress is higher than that of β phase in the specimen with the bimodal microstructure (BM), while the β phase is subjected to much higher stress than α phase in the specimen with the lamellar microstructure (LM). For the specimen with BM, the morphology of α phase leads to a remarkable difference in the microscopic deformation behavior between αp (primary α phase) and αs (secondary α phase). It is suggested that the acicular αs precipitates bear higher stress than equiaxed αp. The intergranular and interphase microstresses in both specimens have been quantitatively evaluated. The results show that the <200>//LD fiber texture of β phase leads to higher intergranular microstress in the specimen with BM. The interphase microstress is more remarkable in the specimen with LM. Combining the in-situ HEXRD and microstructure characterization, the present study provides a fundamental understanding of the relationship between microstructure and mechanical properties from the perspective of micromechanical behavior.

Research Area(s)

  • High-energy X-ray diffraction, Micromechanical behavior, Stress partitioning, Titanium alloys

Citation Format(s)

Effect of initial microstructure on the micromechanical behavior of Ti-55531 titanium alloy investigated by in-situ high-energy X-ray diffraction. / Cui, Yimin; Li, Chaohua; Zhang, Changsheng et al.
In: Materials Science and Engineering A, Vol. 772, 138806, 20.01.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review