Microstructural evolution and age-hardening behavior of quasicrystal-reinforced Mg–Dy–Zn alloy

Microstructural evolution and age-hardening behavior of Mg–2Dy–6Zn (at%) alloy during solid-solution and aging treatment were investigated. The microstructure of as-cast alloy is composed of α-Mg, Mg 3 DyZn 6 (I) phase, Mg 3 Dy 2 Zn 3 (W) phase, Mg(Zn,Dy) phase and a small amount of Mg 0.97 Zn 0.03...

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Bibliographic Details
Published in:Rare metals 2019-08, Vol.38 (8), p.739-745
Main Authors: Bi, Guang-Li, Han, Yu-Xiang, Jiang, Jing, Jiang, Chun-Hong, Li, Yuan-Dong, Ma, Ying
Format: Article
Language:English
Subjects:
Age hardening
Aging (metallurgy)
Biomaterials
Casting alloys
Chemistry and Materials Science
Coprecipitation
Energy
Evolution
Magnesium
Materials Engineering
Materials Science
Metallic Materials
Microstructure
Nanoscale Science and Technology
Phases
Physical Chemistry
Precipitation hardening
Quasicrystals
Solid solutions
Solution heat treatment
Solution strengthening
Zinc
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Summary:Microstructural evolution and age-hardening behavior of Mg–2Dy–6Zn (at%) alloy during solid-solution and aging treatment were investigated. The microstructure of as-cast alloy is composed of α-Mg, Mg 3 DyZn 6 (I) phase, Mg 3 Dy 2 Zn 3 (W) phase, Mg(Zn,Dy) phase and a small amount of Mg 0.97 Zn 0.03 phases. After solid-solution treatment (480 °C, 12 h), all the I phases and most W phases dissolve into α-Mg matrix and the remainder W phases transform into Mg(Dy,Zn) phase and MgDy 3 phase. During aging treatment, I phase and small amounts of W phases co-precipitate from α-Mg matrix, respectively. The alloy exhibits a peak hardness of HV 77.5 at 200 °C for 8 h. The excellent age-hardening behavior of alloy is mainly attributed to the co-precipitation strengthening of I and W phases.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-018-1089-8