摘要
采用光学显微镜、扫描电镜、能谱分析、X射线衍射分析和差示扫描量热分析研究了Al-9.1Zn-1.9Mg-1.6Cu合金铸态与均匀化态显微组织及相组成演化规律。试验结果表明,该合金铸态组织中存在大量的非平衡低熔点共晶相,其初始熔化温度为475℃;合金铸态组织相组成包括α-Al、η-MgZn2及少量的Al7Cu2Fe相;在460℃以上均匀化后,该合金处于α-Al单相区,组织中非平衡低熔点共晶相均能固溶于基体内;465℃×24h是该合金适宜的均匀化处理工艺。
Microstructure evolution and phase constituent of as-cast and homogenized Al-9.1Zn-1.9Mg1.6Cu alloy were investigated by means of optical microscope(OM),SEM(scanning electron microscope),EDS(energy dispersive spectrometer)and XRD(X-ray diffraction)and DSC(differential scanning calorimeter).The results reveal that a lot of nonequilibrium low-melting eutectic phase exist in the ascast microstructure of the alloy,and initial melting temperature reaches 475℃.As-cast microstructure is composed ofα-Al phase,η-MgZn2phase and minor Al7Cu2Fe phase.The alloy is totally composed ofα-Al phase after homogenized at above 460℃,which shows that the non-equilibrium low-melting eutectic phase can dissolve into the matrix entirely.Desirable effects of the alloy can be observed with homogenizing at 465℃for 24hours.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第10期891-893,共3页
Special Casting & Nonferrous Alloys
