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Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion
| Content Provider | MDPI |
|---|---|
| Author | Han, Weihao Li, Yang Li, Pei Su, Guoping Zhang, Chenzeng Sun, Chunfang Chen, Cunguang Yang, Fang Guo, Zhimeng |
| Copyright Year | 2022 |
| Description | In this work, Al-Zn-Mg-Cu powders containing 0.15 and 0.33 wt % oxygen were utilized to prepare high-strength aluminum alloys through the process of cold isostatic pressing, sintering, hot extrusion, and heat treatment. Microstructural and mechanical properties at elevated temperatures of 250, 350, and 450 °C were investigated by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and high-temperature tensile tests. Results showed that the tensile strengths of the obtained Al-Zn-Mg-Cu alloys with 0.15 wt % oxygen were 185, 46, and 18 MPa at 250, 350, and 450 °C, respectively. When the oxygen content of Al-Zn-Mg-Cu alloy rose to 0.33 wt %, the tensile strengths at the corresponding temperature reached up to 205, 68, and 25 MPa, respectively. The excellent high-temperature performance could be attributed to double hindrance to dislocation motion and grain boundary migration by a large amount of nano $γ-Al_{2}O_{3}$ created by the in-creased oxygen, thereby resulting in fine grains even at high temperatures. |
| Starting Page | 259 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met12020259 |
| Journal | Metals |
| Issue Number | 2 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-01-29 |
| Access Restriction | Open |
| Subject Keyword | Metals Manufacturing Engineering Powder Metallurgy Al-zn-mg-cu Alloy High Temperature Strength Oxygen Content |
| Content Type | Text |
| Resource Type | Article |
