Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2018;7:135-41 DOI: 10.1016/j.jmrt.2017.04.006
Original Article
Precipitation of secondary phase in Mg-Zn-Gd alloy after room-temperature deformation and annealing
Hua Huanga,b, Hongwei Miaoa, Guangyin Yuana,, , Chunlin Chenb, Zhongchang Wangb,,
a National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China
b Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Received 01 December 2016, Accepted 10 April 2017
Abstract

Mg-Zn-RE alloys reinforced with quasicrystals have been investigated extensively because they show excellent balance in mechanical properties. Here, we perform deformation and annealing for Mg-1.50Zn-0.25Gd (at.%) alloy at various temperatures, aimed to gain nanoscale precipitates. We find that after the room-temperature compression, the non-basal dislocation, stacking fault and twining are identified in the as-deformed samples, offering clear evidence that these deformation mechanisms can accommodate room-temperature deformation. We also perform systematic transmission electron microscopy observations of the precipitates in both the as-deformed and as-annealed samples. The results identify the formation of a large amount of secondary-phase precipitates, I-phase and MgZn2, when annealed at 200°C, and precipitation of a small amount of W-phase when annealed at 400°C.

Keywords
Mg alloys, Quasicrystal, Deformation, Annealing, Precipitation
J Mater Res Technol 2018;7:135-41 DOI: 10.1016/j.jmrt.2017.04.006