Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 27, Issue 1, Pages 63-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(17)60007-4
Keywords
Mg-Y-Zn alloy; 18R LPSO phase; 14H LPSO phase; high-temperature annealing; microstructure evolution
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Funding
- Natural Science Foundation of Jiangsu Province, China [BK20160869]
- Nantong Science and Technology Program, China [GY12015009]
- Fundamental Research Funds for the Central Universities, China [2015B01314]
- National Natural Science Foundation of China [51501039]
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The microstructural evolution of a 18R single phase (S18) alloy during annealing at 773 K for 100 h was investigated in order to reveal the formation mechanism of 14H phase. The results showed that the as-cast S18 alloy was composed of 18R phase (its volume fraction exceeds 93%), W particles and alpha-Mg phase. The 18R phase in S18 alloy was thermally stable and was not transformed into 14H long period stacking ordered (LPSO) phase during annealing. However, 1411 lamellas formed within tiny a-Mg slices, and their average size and volume fraction increased with prolonging annealing time. Moreover, the 1411 phase is nucleated within alpha-Mg independently on the basis of basal stacking faults (SFs). The broadening growth of 14H lamellas is an interface-controlled process which involves ledges on basal planes, while the lengthening growth is a diffusion-controlled process and is associated with diffusion of solute atoms. The formation mechanism of 14H phase in this alloy could be explained as alpha-Mg+14H.
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