REVIEW PAPER |
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Research Progress of Deformation Induced Localized Solid-state Amorphization in Nanocrystalline Materials |
Wen XI( ),Zheng CHEN,Shi HU
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State Key Laboratory of Solidification Processing, Northwestern Ploytechnical University, Xi’an 710072 |
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Abstract Localized solid-state amorphization (LSSA) transformation of nanocrystalline materials induced by mechanical deformation is proposed to obtain localized amorphous structure in recent years. This new method forms an entirely new plastic deformation mechanism in nanocrystalline materials with dislocation, deformation twinning, grain boundary slide and grain rotation as the main deformation mechanism. The critical transformation condition and the transition mechanism of the LSSA transformation provide a basis for the optimum structural design of materials. This paper summarizes the domestic and foreign experimental and simulative studies of deformation-induced LSSA transformation, such as mechanical ball milling, high-voltage torsional deformation, classical force field and molecular dynamics methods, which prove existence of the deformation-induced LSSA transformation. Also, the intrinsic mechanism of LSSA transformation is analyzed. Based on the advantages of the crystal phase field model, this method is proposed to simulate the LSSA transformation and the crystal phase field method can effectively study the LSSA transformation process.
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Published: 10 January 2018
Online: 2018-01-10
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分子动力学模拟应变速率诱发金属纳米线非晶化的不同应变速率ε’对应的径向分布函数(RDF)曲线:(a)ε’=0.5% ps-1; (b)ε’=5% ps-1[2]
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分子动力学模拟应变速率诱发金属纳米线非晶化的不同应变速率ε’对应的径向分布函数(RDF)曲线:(a)ε’=0.5% ps-1; (b)ε’=5% ps-1[2]
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高压卸载过程中以B4C为转换介质时单晶B4C发生局域非晶化的光镜显微照片和拉曼光谱:(a、d)加载25.9 GPa,(b、e)加载35.8 GPa,(c、f)加载50 GPa;(d—f)图(a—c)中矩形框区域在1 326 cm-1处非晶化峰的拉曼光谱[28]
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高压卸载过程中以B4C为转换介质时单晶B4C发生局域非晶化的光镜显微照片和拉曼光谱:(a、d)加载25.9 GPa,(b、e)加载35.8 GPa,(c、f)加载50 GPa;(d—f)图(a—c)中矩形框区域在1 326 cm-1处非晶化峰的拉曼光谱[28]
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