Microstructure refinement and strengthening of Al–Cu alloys manipulated by nanocrystalline phases formed by in situ crystallization of Ni–Nb–Ti metallic glasses in melt

Journal of Materials Research and Technology

Lin Zhu¹  Shuang Zhang²  Ying-Ying Liu²  Hong-Yu Yang²  He-Li Peng³  Xu Chen⁴  Tao-Tao Duan⁵  Feng Qiu⁶  Zhi-Hao Bai⁶  Tao-Tao Li⁷  Shu-Ming Chen⁷  Xue Han⁷  Qi-Chuan Jiang⁷  Tian-Jing Miao⁷ 

[1] Corresponding authors.;Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun, Jilin Province, 130025, PR China;School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu, PR China;Yangzhou Fengming Photoel Ectric New Material Co., Ltd., Yangzhou, 225117, Jiangsu, PR China;Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun, Jilin Province, 130025, PR China;Shanghai Spaceflight Precision Machinery Institute, Shanghai, 201600, PR China;State Key Laboratory of Automotive Simulation and Control, Jilin University, PR China;

关键词: Nanocrystalline;    Solid–liquid phase transformation;    Thermal analysis;    Microstructure configuration;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, the thermal stability of Ni–Nb–Ti metallic glasses was investigated under isothermal and non-isothermal conditions. The effectiveness of NiTi phases, one of the nanosized crystallized phases, as grain refiners for Al–Cu alloys was also investigated from a crystallographic point of view using the edge-to-edge matching (E2EM) model. Thermal analysis showed that NiTi phases promote solidification of α-Al, and these nanocrystalline phases also promote an Al–Cu eutectic reaction and inhibit the growth of eutectic phases. A significant refining effect of α-Al grains from 402.7 μm to 69.1 μm was achieved with 0.05 wt.% nanocrystalline phases. Simultaneously, values for yield strength, ultimate tensile strength and fracture strain of inoculated Al–Cu alloys were increased by 18%, 13% and 78% to 363.2 MPa, 534.3 MPa and 11.92%, respectively, when compared with those of uninoculated Al–Cu alloys. Strengthening mechanisms of Al–Cu alloys manipulated by the nanocrystalline phases are grain boundary strengthening and precipitation strengthening.

【 授权许可】

Unknown