As-cast microstructure of Mg-Al-Zn magnesium alloys

作者：Zhang Jing^*; Pan Fu sheng; Yang Ming bo; Li Zhong sheng

来源：Transactions of Nonferrous Metals Society of China, 2006, 16: S1655-S1659.

• Mg alloys
• Mg-Al-Zn alloys
• microstructure
• intermetallic compounds
• solidification

The research achievements on as-cast microstructure in Mg-Al-Zn alloy were summarized. Under permanent mould cast condition, there are four kinds of primary compounds with distinct crystallographic morphology, Mg17Al12(gamma), Mg-32(Al,Zn)(49) (tau), MgZn (epsilon) and a ternary icosahedral quasi-crystalline compound (Q). Accordingly, Mg-Al-Zn alloy can be grouped into gamma-, tau-, epsilon- and Q-type alloy by each characteristic compound. The volume fraction Of gamma-Mg17Al12 in commercial gamma-type alloy increases with increasing Al content. MgZn and Mg chi Al gamma Znz ternary complex compounds emerge with the change of the element content Al and Zn and Zn/Al concentration ratio. A practical phase diagram showing microstructure constituent change with composition was proposed. The addition of micro-alloying elements Y and Sr results in not only obvious refinement of eutectic cluster but also eutectic morphological change from block to granule.

• 出版日期2006-12
• 单位重庆大学