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Huajie Wu,Yang Wang,Ruizhi Wu,Feng Zhong,Dan Wang,Legan Hou,Jinghuai Zhang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
To improve comprehensive mechanical properties of Mg-Li alloy, alternative α/β Mg-Li composite sheets with a bimodalgrainedstructure were prepared by accumulative roll bonding (ARB). The microstructure, texture, mechanical propertiesand strain hardening behavior of the alternative α/β Mg-Li composite sheets were studied. The bimodal grain structure,with ultrafine grains (about 0.79 μm) in the α alloy and coarse grains (about 53.28 μm) in the β alloy, can be observed in thecomposite sheet. The dominant texture of α-Mg and β-Li alloys is {0002} basal texture and {110} texture, respectively. Inthe α alloy, the basal texture decreases gradually with the increase of ARB pass, and the non-basal texture is formed in thesheet processed by 5-pass ARB. The dislocation density of the composite sheet gradually increases and approaches saturationafter 3-pass ARB process due to the balance between dislocation accumulation in the ARB process and dislocationannihilation in dynamic recovery. The sheet processed by 3-pass ARB has the preferable strength and plasticity, with yieldstrength, ultimate tensile strength, elongation of 204 MPa, 216 MPa, 22.73%, respectively. Compared with the as-annealedalloys before ARB, the strain hardening rate of the ARB composite sheets increases gradually at low stress (stage II). Mg-Lisheets produced by ARB process remain a high plasticity because of the longer softening stage (stage III), which is mainlycontributed to the synergistic effect of the bimodal grain structure and the activation of non-basal texture.
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Research Progress of Interface Conditions and Tribological Reactions: A Review
Huajie Tang,Jianlin Sun,Jiaqi He,Ping Wu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Tribology plays a crucial role in progress of industry and engineering. The dependence of interfaceconditions and interfacial reactions provides the strategies for friction reduction as well as anti-wear inindustrial processes. That is to modify the surface structure of materials or tune the properties oflubricants. This review provides an overview on the important interface conditions and surface-inducedtribological reactions with emphasis on the underlying of their formation and action mechanism. Thetribological features of asperity, debris and surface texture arefirstly dictated. Then the main surfaceinducedphysicochemical reactions including wetting/dewetting, deposition/adsorption are discussed. Inparticular, the thermal, mechanical and electrical effects that trigger tribochemical reactions are alsoaddressed. Finally, some deficiencies in related investigations are summarized, with perspectives for thedevelopment of tribology in both science research and industrial application.
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