Di Xie
University of Tennessee
Ultimate tensile strengthYield (engineering)Deformation (engineering)CreepPrecipitation hardeningDislocationComposite materialSpiteHardening (metallurgy)Materials scienceDeformation mechanismLattice diffusion coefficientWork hardeningMagnesium alloyClimbAlloyHigh entropy alloysCharacterization (materials science)Field (Bourdieu)Critical resolved shear stressTexture (crystalline)Atmospheric temperature rangeGrain boundaryEngineering ethicsDuctilityCrystal twinningPlasticityMicrostructureActivation energy
Publications 4
#1Di Xie (UT: University of Tennessee)H-Index: 2
#2Zongyang Lyu (UT: University of Tennessee)H-Index: 2
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
view all 8 authors...
Abstract Unlike many Mg alloys that exhibit limited ductility, duplex Mg-Li alloys possess enhanced ductility but the underlying mechanisms are unclear. Using real-time in situ neutron diffraction measurements, we show that the underlying deformation modes in this duplex microstructure include an early yield of body-centered-cubic (BCC) β-Li phase and the later elevated hardening in this phase at large macroscopic plastic strain, and the sequential activation of basal and pyramidal slip systems ...
#1Weidong Li (UT: University of Tennessee)H-Index: 16
#2Di Xie (UT: University of Tennessee)H-Index: 2
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract Research in the field of high-entropy alloys has been surging since the 2010s. As widely acknowledged, research interests in this field are largely sparked by the enormous possibilities in compositions, microstructures, and properties. In the first decade of extensive investigations, while many avenues of research in this vibrant field are being continuously opened, a considerable portion of endeavors is directed toward two very fundamentally important aspects. One is the exploration of...
20 CitationsSource
#1Di Xie (UT: University of Tennessee)H-Index: 2
#2Zongyang Lyu (UT: University of Tennessee)H-Index: 2
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
view all 9 authors...
Abstract This work investigates the microscopic deformation mechanisms of an extruded, precipitation-strengthened AZ80 magnesium (Mg) alloy subjected to strain-controlled low-cycle fatigue using in situ neutron diffraction measurements. Results demonstrate that the plastic deformation during cyclic loading is dominated by the alternating {10.2} extension twinning and detwinning mechanisms. The observed deformation mode is strongly texture and precipitate dependent. For the initial texture, the t...
1 CitationsSource
#1Di Xie (UT: University of Tennessee)H-Index: 2
#2Rui Feng (UT: University of Tennessee)H-Index: 39
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
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Abstract Tensile creep behavior of the CoCrNi medium entropy alloy in a temperature range of 973–1073 K was investigated in this study. According to the fitted stress exponent and activation energy, dislocation climb and lattice diffusion are proposed to be the dominated creep deformation mechanism for this alloy. During creep tests, the plate-like Cr-rich σ phase forms along the grain boundaries of the originally single-phase face-centered-cubic (FCC) CoCrNi alloy. It is suggested that low stac...
7 CitationsSource