Kyushu University Academic Staff Educational and Research Activities Database
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QIANG CHEN Last modified date:2024.01.25

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 Reseacher Profiling Tool Kyushu University Pure
Qiang Chen .
Academic Degree
PhD in Materials Science
Field of Specialization
Fatigue and Fracture, Strength of Materials
Total Priod of education and research career in the foreign country
Outline Activities
Current researches include characterizing the fatigue behavior of high strength Mg and Ti alloys in such a way that the relationship between microstructure and mechanical properties will be elucidated at all scales especially from microscopic to atomic scale.

Keywords: Fatigue and Fracture, Very High Cycle Fatigue, Relation between Microstructure and Mechanical Behavior, LPSO Mg Alloys, Ti Alloys, Fatigue in MEMS/BioMEMS, In-Situ TEM/STEM Analysis
Research Interests
  • Fatigue Characterization of Ultrahigh Strength Mg-Gd-Y-Zn-Zr Alloy with Hierarchical Anisotropic Nanostructure
    keyword : Mg-RE alloy; Very high cycle fatigue; Fatigue crack initiation; Fatigue-induced oxidation; Oxygen embrittlement
  • Bismuth Titanate-based high temperature piezoceramics: domain structure and polarization dynamics
    keyword : Bismuth, Titanate-based, piezoceramics, domain structure, polarization dynamics
  • Characterization of Crack Nucleation in Titanium Alloys with Metastable Microstructures
    keyword : Titanium Alloys, Ultra-high Cycle, Fatigue, Ultra-slow Crack Growth
  • Ultra-high Cycle Fatigue Characterization and Ultra-slow Crack Growth of Titanium Alloys
    keyword : Titanium Alloys, Ultra-high Cycle, Fatigue, Ultra-slow Crack Growth
  • Tensile and Fatigue Behavior of Electron Beam Welded TC17 Titanium Alloy Joint
    keyword : Tention, Fatigue, Ti Alloy, Small Crack, Crack Nucleation, Crack Propagation, Fracture
  • Very High Cycle Fatigue of Super Light High Strength Mg Alloys
    keyword : Fatigue, Mg Alloy, Small Crack, Crack Nucleation, Crack Propagation, Fracture
  • Mechanical Characterization of Parylene C Thin Films
    keyword : Parylene C, Thin Film, Mechanical Properties, Size Effect
Academic Activities
1. Jun Song, Hanqing Liu, Jie Cui, Yongjie Liu, Lang Li, Yao Chen, Qingyuan Wang, Qiang Chen, Crack initiation and short crack propagation of friction stir welded TC17 alloy joint, International Journal of Fatigue, 10.1016/j.ijfatigue.2022.107426, 168, 2023.03, Heterogeneities of microstructure, tensile and fatigue behavior of FSWed titanium alloy joint were in-situ studied by utilizing replica, DIC and electron back-scattered diffraction methods. Banded TMAZ consisting of needle-like α precipitates and elongated αp within DRXed β grains bridges the HAZ and SZ. Fine β grains in SZ contribute to the highest tensile strength in the 3rd layer. Fatigue cracks prefer to nucleate from HAGBs and {1 1 2} 〈1 1 1〉 slip deformation of β structure in the 2nd layer of SZ below 210 MPa and 3rd layer of HAZ otherwise. Transgranular crack propagation along the {1 1 2} planes exhibits a higher crack growth rate in HAZ than SZ..
2. Shaoxiong Xie, Jikai Shi, Qian Xu, Qingyuan Wang, Jianguo Zhu, Yukio Sato, Qiang Chen, In-depth understanding of {110}-type domain walls in bismuth titanate ceramics, Scripta Materialia, 10.1016/j.scriptamat.2022.114793, 217, 2022.08, Bismuth titanate(BIT) ceramics have been widely studied for high temperature applications thanks to their high Curie temperature and large spontaneous polarization. The underlying domain structures play significant roles in regulating the macroscopic properties of ferroelectric materials, while there is only limited knowledge of the domain structures for BIT ceramics until now, substantially bad for the development of BIT-based new materials. In this study, the intriguing domain walls(DWs) in BIT ceramics were investigated in detail. The atomic-scale observation reveals that there primarily exist energetically favorable {110}-type 90° DWs in BIT ceramics. Combined with the theoretical analysis, these DWs are not only elaborated under multiple piezoelectric response modes, but also further corroborated by the quantitative reconstruction of spatial polarization distributions of twin-related ferroelectric variants. This work sheds insight into domain structure and piezoelectric response mechanism in BIT ceramics, and contributes to promoting their more applications in advanced electron devices..
3. Hanqing Liu, Jun Song, Xiaojian Cao, Luopeng Xu, Yaohan Du, Lang Li, Qingyuan Wang, Qiang Chen, Enhancement of fatigue resistance by direct aging treatment in electron beam welded Ti–5Al–2Sn–2Zr–4Mo–4Cr alloy joint, Materials Science and Engineering: A, 10.1016/j.msea.2021.142168, 829, 142168-142168, 2022.01.
4. Hanqing Liu, Jun Song, Haomin Wang, Chuanli Yu, Yaohan Du, Chao He, Qingyuan Wang, Qiang Chen, Slip-driven and weld pore assisted fatigue crack nucleation in electron beam welded TC17 titanium alloy joint, International Journal of Fatigue, 10.1016/j.ijfatigue.2021.106525, 154, 106525-106525, 2022.01.
Membership in Academic Society
  • American Society of Mechanical Engineers
  • The Minerals Metals & Materials Society (TMS)
  • Materials Research Society
  • The Japan Society of Mechanical Engineers
Educational Activities
Current educational activities include (1) instruction for both postgraduate and undergraduate students, (2) teaching courses in English such as
Drawings on Technical Design, Mechanical and Aerospace Engineering Drawing and Design, Strength of Materials, Advanced Material Strength, Seminar in Material Strength, Communication for Mechanical Engineering, and (3) developing and management of inbound and outbound global study programs.