An investigation of metallurgical bonding in Al-7Si/gray iron bimetal composites

作者：Liu Yang; Bian Xiufang^*; Yang Jianfei; Zhang Kai; Feng Le; Yang Chuncheng

来源：Journal of Materials Research, 2013, 28(22): 3190-3198.

DOI：10.1557/jmr.2013.328

• joining
• composite
• microstructure

Al-7Si/gray iron bimetal composites with a sound metallurgical bonding were obtained by a gravity die casting process. The surface treatments of the gray iron specimen including fluxing and hot dipping were applied to forming a complete metallurgical bonding layer at the Al-7Si/gray iron interface. In addition, the effect of Mn in dipping bath on the microstructure of the Al-7Si/gray iron interfacial bond zone has been studied in an Al-7Si alloy containing five different levels of Mn ranging from 0 to 5 wt%. Microstructure analysis indicates that addition of Mn in dipping bath can eliminate the harmful needle-like phase (-Al5FeSi) as the Mn content is no less than 1.5 wt% and also plays an important role in facilitating the growth of intermetallic phases [-Al-15(FexMn1-x)(3)Si-2] and the metallurgical bonding layer. The sound metallurgical bonding formed at the Al-7Si/gray iron interface is attributed to combining the effect of surface treatments and selection of Mn content.

• 出版日期2013-11-28
• 单位山东大学