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Featured researches published by Lishi Ma.


Materials Research Express | 2016

Phase stability, elastic anisotropy and electronic structure of cubic MAl2 (M = Mg, Ca, Sr and Ba) Laves phases from first-principles calculations

Yuanyuan Kong; Yonghua Duan; Lishi Ma; Runyue Li

By performing first-principles calculations within the generalized gradient approximation, the phase stability, elastic constant and anisotropy, and density of states of cubic C15-type MAl2 (M = Mg, Ca, Sr and Ba) Laves phases have been investigated. Optimized equilibrium lattice parameters and formation enthalpies agree well with the available experimental data. Elastic constants C ij have been evaluated, and these C15-type MAl2 Laves phases are mechanically stable due to the meeting of C ij to the mechanical stability criteria. Polycrystalline elastic moduli have been deduced from elastic constants by Voigt–Reuss–Hill approximation. Plastic properties were characterized via values of B/G, Poissons ratio ν and Cauchy pressure (C 12-C 44). The elastic anisotropy has been considered by several anisotropy indexes (A U , A Z , A shear and A comp), anisotropy of shear modulus, and 3D surface constructions of bulk and Youngs moduli. Additionally, the sound velocity anisotropy and Debye temperature were predicted. Finally, electronic structures were carried out to reveal the underlying phase stability mechanism of these Laves phases.


Philosophical Magazine | 2017

Phase stability, anisotropic elastic properties and electronic structures of C15-type Laves phases ZrM2 (M = Cr, Mo and W) from first-principles calculations

Lishi Ma; Y.H. Duan; Runyue Li

Abstract Systematic investigations of phase stability and mechanical properties of C15-type ZrM2 (M = Cr, Mo and W) Laves phases were performed using first-principles calculations. The formation enthalpies of ZrM2 are in good agreement with the theoretical and experimental values. The elastic properties, including elastic constants and moduli, Poisson’s ratio and B/G, were discussed. The elastic anisotropy was also investigated via the anisotropy indexes (AU, AZ, Ashear and Acomp), the anisotropy of shear modulus and the 3D construction of bulk and Young’s moduli. The elastic anisotropy of ZrM2 is in order of ZrCr2 < ZrMo2 < ZrW2. The variations in the shear modulus and hardness show similar trends with increasing values from ZrCr2 to ZrW2. The electronic structures for these C15-type Laves phases were analysed to obtain deeper understanding of chemical bonds and phase stabilities. Finally, the sound velocities and Debye temperatures were also investigated.


Journal of Alloys and Compounds | 2018

Elastic anisotropies and thermal conductivities of WB 2 diborides in different crystal structures: A first-principles calculation

Ping Li; Lishi Ma; M.J. Peng; Baipo Shu; Yonghua Duan


Materials Characterization | 2017

Developed constitutive models, processing maps and microstructural evolution of Pb-Mg-10Al-0.5B alloy

Yonghua Duan; Lishi Ma; Huarong Qi; Runyue Li; Ping Li


Journal of Materials Engineering and Performance | 2017

Microstructure, Growth Kinetics and Some Mechanical Properties of Boride Layers Produced on Pure Titanium by Molten-Salt Boriding

Lishi Ma; Yonghua Duan; Ping Li


Journal of Alloys and Compounds | 2018

Surface evolution and growth kinetics of Ti6Al4V alloy in pack boriding

Yonghua Duan; Ping Li; Zhizhong Chen; Jian Shi; Lishi Ma


Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science | 2017

Dynamic Recrystallization and Processing Map of Pb-30Mg-9Al-1B Alloy During Hot Compression

Yonghua Duan; Ping Li; Lishi Ma; Runyue Li


Journal of Alloys and Compounds | 2017

Corrosion behavior of Pb-39Mg-10Al-1.5B alloy in sodium halide solutions

Yonghua Duan; Ping Li; Min Zhang; M.J. Peng; Lishi Ma; Baipo Shu


Physica B-condensed Matter | 2018

First-principles calculations of structure and electronic properties of aluminum doped by Ge, Sn and Pb

Hongwei Shou; M.J. Peng; Yonghua Duan; Lishi Ma; Ping Li


Journal of Alloys and Compounds | 2018

Characteristics of surface layers on Ti6Al4V alloy borided with CeO2 near the transition temperature

M.J. Peng; Yonghua Duan; Lishi Ma; Baipo Shu

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Yonghua Duan

Kunming University of Science and Technology

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Ping Li

Kunming University of Science and Technology

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M.J. Peng

Kunming University of Science and Technology

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Runyue Li

Kunming University of Science and Technology

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Baipo Shu

Kunming University of Science and Technology

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Dan Liu

Kunming University of Science and Technology

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Hongwei Shou

Kunming University of Science and Technology

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Huarong Qi

Kunming University of Science and Technology

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Min Zhang

Liaoning Normal University

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S. Chen

Kunming University of Science and Technology

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