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QIANG CHEN Last modified date：2024.04.24

Professor / Strength of Materials
Department of Mechanical Engineering
Faculty of Engineering


Graduate School
Department of Mechanical Engineering
Graduate School of Engineering
Undergraduate School
Department of Mechanical and Aerospace Engineering
School of Engineering
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Homepage
https://kyushu-u.elsevierpure.com/en/persons/qiang-chen
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Qiang Chen .
Field of Specialization
Fatigue and Fracture, Strength of Materials
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
Research Interests
  • Ultra-high cycle fatigue strength of hierarchical anisotropic nanostructured alloys by precision structural analysis
    keyword : Fatigue, Hierarchical Anisotropic Nanostructure, Ultra-high Cycle, Precision Structural Analysis, Mg Alloys
    2022.04～2025.03.
  • 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
    2022.11～2024.11.
  • Bismuth Titanate-based high temperature piezoceramics: domain structure and polarization dynamics
    keyword : Bismuth, Titanate-based, piezoceramics, domain structure, polarization dynamics
    2021.08～2023.07.
  • Characterization of Crack Nucleation in Titanium Alloys with Metastable Microstructures
    keyword : Titanium Alloys, Ultra-high Cycle, Fatigue, Ultra-slow Crack Growth
    2020.08～2022.07.
  • Ultra-high Cycle Fatigue Characterization and Ultra-slow Crack Growth of Titanium Alloys
    keyword : Titanium Alloys, Ultra-high Cycle, Fatigue, Ultra-slow Crack Growth
    2019.05～2021.04.
  • Tensile and Fatigue Behavior of Electron Beam Welded TC17 Titanium Alloy Joint
    keyword : Tention, Fatigue, Ti Alloy, Small Crack, Crack Nucleation, Crack Propagation, Fracture
    2018.10～2021.03.
  • Very High Cycle Fatigue of Super Light High Strength Mg Alloys
    keyword : Fatigue, Mg Alloy, Small Crack, Crack Nucleation, Crack Propagation, Fracture
    2016.04～2019.03.
  • Mechanical Characterization of Parylene C Thin Films
    keyword : Parylene C, Thin Film, Mechanical Properties, Size Effect
    2016.04.
Current and Past Project
  • Domain structures in BIT perovskite piezoelectrics were probed by PFM and TEM techniques. The TEM experimental results show that there mainly exist (110)-type 90 degree domain walls in the pure BIT ceramics. However, for the doped BIT ceramics, numerous (001)-type 180 degree domain walls appear on the lateral planes of grains. These domain walls were further examined by 3D PFM experiments, whose spatially visualized models were successfully established combined with the atomic observations of ion displacement and polarization shift via STEM. In addition, the polarization switching of BIT ceramics was initially investigated by a conductive PFM probe, which reveals the independent switching behaviors of polarization vector along a-axis and c-axis of unit cell.
  • The proposed subject aims at unraveling the mechanical response of supersaturated phases with/without martensitic microstructures in titanium alloys under a wide range of strain rate, including the fatigue crack initiation mechanisms, twinning mechanisms, phase transformation mechanisms and dynamic distribution of solute atoms.
Academic Activities
Reports
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Papers
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1. X. H. Shao, C. He, H. Q. Liu, N. Su, Y. J. Wu, Q. Chen, X. L. Ma, Amorphization of nano-Mg layers in LPSO-containing magnesium alloy during cyclic deformation, Scripta Materialia, 10.1016/j.scriptamat.2024.116059, 245, 2024.05, Microstructural evolution during fatigue is of significance for understanding the fatigue cracking of metallic alloys. Here, we visualized amorphization near the fatigue facets for an Mg-Gd-Y-Zn-Zr alloy with long-period stacking ordered (LPSO) phase upon very high cycle fatigue (VHCF). The small amorphous patches occurred in the relatively soft nano-Mg layers, compared to the hard LPSO phase, and the amorphous band propagated along with the basal plane near the LPSO/Mg interface. This should be intimately related to the local dislocation accumulation and cumulative damage upon the cycle loading-unloading..
2. Shaoxiong Xie, Qian Xu, Qiang Chen, Jianguo Zhu, Qingyuan Wang, Realizing super-high piezoelectricity and excellent fatigue resistance in domain-engineered bismuth titanate ferroelectrics, advanced functional materials, 2024.02.
3. 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..
4. 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..
5. 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.
6. 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.
Presentations
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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
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.


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