High temperature DSC study on interfacial reaction of aluminum borate whisker reinforced aluminum alloys
(State Key Laboratory of Mital Matrix Composites; Shanghai Jiao Tong University; Shanghai 200030; P. R. China)
Abstract: Aluminum borate (9Al2O32B2O3 ) whisker reinforced ZL109 alloy and pure Al were fabricated by squeeze casting technique. By means of high temperature DSC, the inter facial reaction of these composites was studied in detail, and reaction products were analyzed by using XRD and SEM. It was shown that in the 9Al2O32B2O3,w/Al composites, the pure Al can react with the 9AlO32B2O3 whisker and the critical temperature is 756 ℃. In the composites, the chemical reaction occurs at the interface and the product is identified to be spinel MgAl2O4. The magnesium is one of main factors that cause the interfacial reaction, oxygen promotes the interfacial reaction, but Cu, Ni elements in ZL109 alloy don't take part in the interfacial reaction. The temperature is another main factors that cause interfacial reaction. When the temperature is higher than 690℃, both Mg and Al elements can react with the whisker. When the temperature ranges from 449℃ to 690 ℃, only Mg element reacts with the whisker. T6 heat treatment causes more serious interfacial reaction.
附件:1999-4-24
附件:1999-4-24
Key words: composites; aluminum borate whisker; interfacial reaction