Interfacial reactions in glass/Al–Mg composite fabricated by powder metallurgy process

• Published in: Journal of materials processing technology Vol. 161; no. 3; pp. 445 - 448
• Main Authors: Guobin, Li, Jibing, Sun, Quanmei, Guo, Yuhui, Wu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.04.2005
• Subjects: Glass/Al–Mg composites; Interfacial reactions; Kinetics; Thermodynamics; Glass/Al–Mg composites; Thermodynamics; Kinetics; Interfacial reactions
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2004.07.081

The interfacial reactions between glass particles and Al–Mg matrix during fabrication by powder metallurgy processes by pressure sintering at 610 °C for 30 min have been studied using scanning electron microscopy (SEM), electron probe and X-ray diffraction. Experimental results show that MgO, MgAl 2O 4 and Mg 2Si are the main reaction compounds produced by the reactions of SiO 2(s) + 2Mg(l) → 2MgO(s) + Si(s), 2SiO 2(s) + 2Al(s) + Mg(l) → MgAl 2O 4(s) + 2Si(s) and 2Mg(l) +Si → Mg 2Si. The grain boundaries between MgO, MgAl 2O 4 and Mg 2Si are believed to be the diffusion paths (or channels) during the interfacial reactions. The thickness of reaction layer is controlled by the reaction diffusions between O, Mg, Si and Al. Investigation shows that MgAl 2O 4 is particles shape and MgO and Mg 2Si shows samdwich in SiO 2 particles, and Mg 2Si is still formed in Al–Mg matrix with particles form.