A1-Si过共晶合金拉伸断裂过程的研究  

Research of Tension Fracture Process of Al-Si Hypereutectic Alloy

作　　者：苏辉[1] 吕柏林[2] 

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [2]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《材料开发与应用》2008年第2期22-23,26,共3页Development and Application of Materials

摘　　要：以铸造Al-Si过共晶合金为研究对象,采用现场金相显微镜对Al-Si过共晶合金的断裂过程进行观察,探讨了两相合金的断裂机理。试验发现:Al-Si过共晶合金的断裂首先发生在先析Si相的凹角处,随着外力的增加,裂纹向先析Si相内部进行扩展,达到相界处时改变方向,沿着Al-Si两相的相界进行扩展。分析认为:Al-Si两相合金中,相界的结合强度最弱,裂纹的扩展是择弱进行的。Fracture mechanism of two-phase alloy is discussed based on the observation of the fracture process of Al-Si hypereutectic alloy by Using optical microscopy. It is found that the fracture of Al-Si hypereutectic alloy occurs firstl on the nook of primary silicon and with the increase of outer forces, the crack expands to the internal of primary silicon and the direction changes at the phase boundary and expands along the phase boundary. Analysis suggests that the bonding strength Of the phase boundary is the weakest and crack propagation occurs preferably in the weak for Al-Si two-phase alloy.

关 键 词：AL-SI过共晶合金 现场金相 断裂 

分 类 号：TG146.4[一般工业技术—材料科学与工程]