Microstructure and mechanical properties of the Mg-Gd-Zn alloy prepared by sintering of rapidly-solidified ribbons.

ABSTRACT: Mg-15Gd-1Zn (wt.%) alloy was successfully prepared via the spark plasma sintering rapid solidification ribbons process. Microstructure investigation showed that the sintered alloys consisted of fine grains, the β₁ phase, and long-perioded stacking ordered phase (LPSO). The sintering temperature and time have a significant effect on the microstructural evolution. A lower sintering temperature (430 °C ) was beneficial for obtaining finer grain sizes with less than 5 μm and a higher content of β₁ phase with a content of 3-15 vol.% and a size-distribution of (10-600) nm. A higher temperature for a longer sintering time, 450-470 °C and 5-10 min, helpfully promoted precipitating the abundantly lamellar LPSO phase, and its content was 2-10 vol.% for LPSO phase with the width of (10-100) nm. The mechanical properties indicated that the fine grain size and supersaturated solid solution contributed at least 50% of the yield stress, and the residual contribution was related to the β₁ phase and LPSO phase strengthening, which were based on their contents and the sizes.

SUBMITTER: Luo W 

PROVIDER: S-EPMC9243015 | biostudies-literature |

REPOSITORIES: biostudies-literature