In situ nanocrystals manipulate solidification behavior and microstructures of hypereutectic Al-Si alloys by Zr-based amorphous alloys

• DOI: 10.1016/j.jmrt.2020.02.091
• Publication Date: 2020-03-18T12:34:15Z
• Authors: Shuan Liu; Xin Zhang; He-Li Peng; Xing Han; Hong-Yu Yang; Tao-Tao Li; Lin Zhu; Shuang Zhang; Feng Qiu; Zhi-Hao Bai; Shu-Ming Chen; Wei Zhou; Qi-Chuan Jiang
• Keywords: Mining engineering. Metallurgy; Amorphous alloys; TN1-997; Microstructure manipulation; Mechanical properties; 02 engineering and technology; 0210 nano-technology; Solidification behavior

In this study, different contents (0.0, 0.1, 0.2, and 0.4 wt.%) of Zr55Cu30Al10Ni5 amorphous alloys (Zr-AA) are used to manipulate hypereutectic Al-Si alloys. The edge-to-edge model shows that there is a perfect lattice matching between the crystallized phases α-Al Si phases. thermal analysis solidification behavior unmanipulated manipulated by Zr-AA, indicates addition Zr-AA greatly promotes nucleation primary significantly accelerates process eutectic reaction. When optimal content 0.2 wt.% sizes dendrites decrease from 212.46 μm 19.24 143.39 16.47 μm, respectively. changes needle-like rod-like exhibits mean size 20.21 11.69 μm. Meanwhile, exhibit ultimate tensile strength 362 MPa fraction strain 2.21% after manipulation, which 23% 37% higher than those alloy (295 1.61%). strengthening mechanisms in situ nanocrystals melt mainly attributed fine grain effect precipitation effect. increase plasticity due refinement morphology improvement