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In situ ESEM study of partial melting and precipitation process of AZ91D
Author(s) -
Hung Jenny HaoHsin,
Chiu Yu Lung,
Zhu Tianping,
Gao Wei
Publication year - 2007
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.87
Subject(s) - partial melting , eutectic system , environmental scanning electron microscope , precipitation , lamellar structure , materials science , scanning electron microscope , in situ , metallurgy , phase (matter) , alloy , chemistry , composite material , geology , physics , geochemistry , organic chemistry , mantle (geology) , meteorology
In this paper, we report the results of the investigation of partial melting and precipitation processes of an AZ91D magnesium alloy using an in‐situ heating stage located in an environmental scanning electron microscope (ESEM). For the first time, in‐situ partial melting of the β phase (Al 12 Mg 17 ) was observed to initiate in the middle of the large grain boundary β islands, at temperatures around 420 °C. Upon cooling, areas where partial melting of the β phase had occurred solidified into voids. Partial melting of β lamellae within the discontinuous eutectic β/α lamellar structures has not been observed in the present study. Following a solution treatment and aging process, the β phase exists as fine submicron precipitates. Copyright © 2007 Curtin University of Technology and John Wiley & Sons, Ltd.