CAJ | 학술논문

采用金相显微镜、扫描电子显微镜、透射电子显微镜和差示扫描量热法研究Al-0.66Mg-0.85Si合金在均匀化过程中的组织演变。合金铸态组织呈典型的枝晶形貌，存在α(Al)、Al15(FeMn)3Si2、Mg2Si,、Q(Al1.9CuMg4.1Si3.3)和Si相。铸态组织中存在2种不同晶体结构的Mg2Si相，一种是在铸造过程中形成的，另一种是在铸造完成后的空冷过程中形成的。经过545°C、20 h均匀化处理之后，组织中的Q、Mg2Si和Si相已完全溶入基体，残留的第二相主要是Al15(FeMn)3Si2相。Al15(FeMn)3Si2相的尺寸减小、球化并且在晶界上断续分布。在铸态和均匀化热处理状态中，均未发现含Zn相。
채용금상현미경、소묘전자현미경、투사전자현미경화차시소묘량열법연구Al-0.66Mg-0.85Si합금재균균화과정중적조직연변。합금주태조직정전형적지정형모，존재α(Al)、Al15(FeMn)3Si2、Mg2Si,、Q(Al1.9CuMg4.1Si3.3)화Si상。주태조직중존재2충불동정체결구적Mg2Si상，일충시재주조과정중형성적，령일충시재주조완성후적공랭과정중형성적。경과545°C、20 h균균화처리지후，조직중적Q、Mg2Si화Si상이완전용입기체，잔류적제이상주요시Al15(FeMn)3Si2상。Al15(FeMn)3Si2상적척촌감소、구화병차재정계상단속분포。재주태화균균화열처리상태중，균미발현함Zn상。
The microstructural evolution of Al-0.66Mg-0.85Si alloy was investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The as-cast microstructure is typical dendritical structure, consisting of α(Al), Al(FeMn)Si, Mg2Si, AlCuMgSi and Si phases. The electron diffraction analyses indicate that the Al(FeMn)Si phase is Al15(FeMn)3Si2 and the AlCuMgSi phase is Q(Al1.9CuMg4.1Si3.3). There are two kinds of Mg2Si phases in the as-cast microstructure. One is formed in the casting process, and the other is formed in the cooling process after casting process is finished. The phases have different crystal structures. After homogenization treatment at 545 °C for 20 h, Mg2Si, Si and Q intermetallic compounds are dissolved into matrix completely, and the remaining phases are α(Al) and Al15(FeMn)3Si2. The size of Al15(FeMn)3Si2 phase is decreased, and the phase is spheroidized and distributes along grain boundary discontinuously. The Zn-containing phases are not found during solidification and homogenization process.