Microstructure evolution difference in Mg96.5Gd2.5Zn1 alloys extruded from as-cast and solution-treated states

Ning Su, Yujuan Wu, Yu Zhang, Xiaowei Cheng, Liming Peng, Kun Yang, Qiang Chen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Microstructure evolution and mechanical properties of Mg96.5Gd2.5Zn1 alloys in as-cast and solution-treated states were systematically studied during hot extrusion. The as-cast alloy mainly contains eutectic (Mg,Zn)3Gd compound, block-shaped 18R-LPSO structure and Mg matrix with a few lamellar long-period stacking order (LPSO) structures. The solution-treated alloy has a block-shaped 14H-LPSO structure at grain boundaries (GBs) and high-density lamellar LPSO structures within the matrix. After hot extrusion, the (Mg,Zn)3Gd phase and 18R-LPSO structure were broken an kinked, respectively. Bimodal microstructure with fine recrystallized (DRXed) grains and coarse-deformed grain were formed in both studied alloys. Sandwich-like distribution of the fine DRXed grain was observed in the as-cast-extruded alloy, which shows obviously different DRX behavior compared with the solution-treated-extruded alloy that recrystallizes at GBs. The result reveals that lamellar LPSO structure promotes DRX formation in the LPSO-free region of the matrix by accumulating dislocations at the interface frontier of lamellar LPSO/matrix. Moreover, the LPSO structure, fine DRXed grains and nanoparticles at GBs enhanced the yield strength of the wrought alloy.

Original languageEnglish
Article number116666
JournalJournal of Materials Processing Technology
Volume282
DOIs
Publication statusPublished - Aug 2020

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Microstructure evolution difference in Mg<sub>96.5</sub>Gd<sub>2.5</sub>Zn<sub>1</sub> alloys extruded from as-cast and solution-treated states'. Together they form a unique fingerprint.

Cite this