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Effect of homogenization treatment on microstructure and mechanical properties of DC cast 7X50 aluminum alloy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Cong, Fu-Guan Zhao, Gengfu Jiang, Feng Tian, Ni Li, Rui-Feng |
| Copyright Year | 2015 |
| Abstract | The evolution of the eutectic structures in the as-cast and homogenized 7X50 aluminum alloys was studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), differential scanning calorimetry(DSC), X-ray diffraction(XRD) and tensile test. The results show that the main phases are S(Al2CuMg), T(Al2Mg3Zn3) and MgZn2, with a small amount of Al7Cu2Fe and Al3Zr in the as-cast 7X50 alloy. The volume fraction of the dendritic-network structure and residual phase decreases gradually during the homogenization. After homogenization at 470 °C for 24 h and then 482 °C for 12 h, the T(Al2Mg3Zn3) phase disappears and minimal S(Al2CuMg) phase remains, while almost no change has happened for Al7Cu2Fe. There is a strong endothermic peak at 477.8 °C in the DSC curve of as-cast alloy. A new endothermic peak appears at 487.5 °C for the sample homogenized at 470 °C for 1 h. However, this endothermic peak disappears after being homogenized at 482 °C for 24 h. The T(Al2Mg3Zn3) phase cannot be observed by XRD, which is consistent with that T phase is the associated one of S(Al2CuMg) phase and MgZn2 phase. The volume fraction of recrystallized grains is substantially less in the plate with pre-homogenization treatment. The strength and fracture toughness of the plate with pre-homogenization treatment are about 15 MPa and 3.3 MPa·m 1/2 higher than those of the material with conventional homogenization treatment. |
| Starting Page | 1027 |
| Ending Page | 1034 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/S1003-6326(15)63694-9 |
| Alternate Webpage(s) | http://www.ysxbcn.com/down/2015/04_cn/01-p1027.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/S1003-6326%2815%2963694-9 |
| Volume Number | 25 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
