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2D70耐热铝合金显微组织均匀化热处理

2017-02-09 15:51来源:中錾集团SinoAV作者:通项公司TXCO 

2D70耐热铝合金显微组织均匀化热处理Homogenization treatment and microstructure of semicontinous casting ingot of 2D70 heat-resistance aluminum alloy

利用光学显微镜、扫描电子显微镜、能谱分析、差示扫描量热、X射线物相分析研究2D70耐热铝合金半连续铸锭的结晶相及合理的均匀化热处理制度。结果表明:合金半连续铸锭中枝晶偏析严重,存在大量非平衡共晶相,其成分为α(Al)+θ(Al2Cu)+S(Al2CuMg),其初始熔化温度为505.4 ℃;在530 ℃温度以下进行均匀化时,合金中的难溶相Al7Cu2Fe、Al7Cu4Ni、Al9FeNi含量基本没有变化;合金合理的均匀化热处理制度为(490 ℃, 16 h)+(520 ℃, 16 h)。
The constituents of the semicontinuous casting ingot of 2D70 heat-resistance aluminum alloy and homogenization treatment were studied by optical microscopy (OM), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX),differential scanning calorimetry(DSC) and X-ray diffraction analysis (XRD). The results indicate that the semicontinuous casting ingot of 2D70 aluminum alloy presents a dendritic microstructure with severe segregation. The phases of the nonequilibrium eutectic are α(Al)+ θ(Al2Cu) +S(Al2CuMg) whose overheating temperature is 505.4 ℃. The volume fraction of hard dissolve phases such as Al7Cu2Fe, Al7Cu4Ni and Al9FeNi changes a little below 530 ℃. The reasonable homogenization treatment process of the alloy is (490 ℃, 16 h) +(520 ℃, 16 h).