Microstructure evolution of Mg–10Gd–3Y–1.2Zn–0.4Zr alloy during heat-treatment at 773 K

• Published in: Journal of alloys and compounds Vol. 468; no. 1; pp. 164 - 169
• Main Authors: Li, D.J., Zeng, X.Q., Dong, J., Zhai, C.Q., Ding, W.J.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 22-01-2009; Elsevier
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; High temperature heat-treatment; Long period stacking ordered structure (LPSO); Materials science; Mg–Gd–Y–Zn–Zr alloys; Other heat and thermomechanical treatments; Physics; TEM; Treatment of materials and its effects on microstructure and properties; Long period stacking ordered structure (LPSO); High temperature heat-treatment; TEM; Mg–Gd–Y–Zn–Zr alloys; Scanning electron microscopy; Magnesium base alloys; Stacking faults; Transmission electron microscopy; SAED; Microstructure; Mg-Gd-Y-Zn-Zr alloys; Heat treatments; Cast alloy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.01.078

Microstructure evolution of Mg–10Gd–3Y–1.2Zn–0.4Zr alloy during high temperature heat-treatment at 773
K in the time range 12–72
h is investigated. Addition of 1.2% Zn increases the amount of Mg
5(Gd,Y,Zn) eutectic compounds and form of basal plane stacking faults (SF) of Mg crystal in the as-cast alloy. During heat-treatment at 773
K, parts of eutectic compounds dissolve gradually into the matrix with time prolonged, a new 14H type of LPSO and fcc structured cuboid-shaped RE-rich phases come into being. Two kinds of morphologies of these 14H LPSO phases: block-shaped and fine lamellar-shaped are generated through transformation from Mg
5(Gd,Y,Zn) eutectic compounds by heat treatment control.