Dynamic Mechanical Behavior and Hypervelocity Impact Performance of an Al-Based Nanocrystalline Alloy

作     者：Shan-Shan Deng Gang Wang Run-Qing Chi Bao-Jun Pang Dong-Jun Wang Jun Shen 

作者机构：School of Materials Science and Engineering Harbin Institute of Technology Harbin China Laboratory for Microstructures Institute of MaterialsShanghai University Shanghai China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin China Key Laboratory of Micro-Systems and Microstructures Manufacturing Ministry of Education Harbin China School of Materials Science and Engineering Tongji University Shanghai China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2017年第30卷第12期

页      面：1169-1176页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China (No.51674093) the Natural Science Foundation of Heilongjiang Province (No.E201425) the Fundamental Research Funds for the Central Universities (No.HIT.MKSTISP.2016019) the Postdoctoral Scientific Research Development Fund of Heilongjiang Province (No.LBH-Q15040) 

主　　题：Nanostructure material Sintering Mechanical properties Computer simulation Spacecraft shielding 

摘      要：In a wide strain rate range from 10^-5 to 10^3s^-1, the deformation behavior of an Al-based nanocrystalline alloy was investigated. After fracture, the debris collected was used for statistical analysis, which is expected to reflect the profile of the fracture behavior of the alloy. The energy absorption of alloy at different strain rates was elucidated on account of mass distribution of debris. Based on the parameters obtained by the compression experiment at different strain rates, the numerical simulation experiment was carried out to evaluate the performance of Al-based nanocrystalline alloy as spacecraft shielding. The results suggest that Al-based nanocrystalline alloys have better shield performance than alu- minum alloy under the identical areal density at velocity of 1-7 km/s. The better shield performance is attributed to high fracture strength, high hardness and low toughness of Al-based nanocrystalline alloy as compared with those of aluminum alloy.