Unexpected Expansion Behavior of Mg-Al Alloys During Isothermal Ageing
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in: JOM: Journal of The Minerals, Metals & Materials Society, Jahrgang 71, Nr. 8, 15.08.2019, S. 2906-2912.
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Unexpected Expansion Behavior of Mg-Al Alloys During Isothermal Ageing
AU - Zhang, Xiao
AU - Huang, Yuanding
AU - Li, Xiaohu
AU - Gan, Weimin
AU - Kainer, Karl Ulrich
AU - Hort, Norbert
PY - 2019/8/15
Y1 - 2019/8/15
N2 - The precipitation behavior of Mg-Al alloys during isothermal ageing has been investigated by dilatometry. Only continuous precipitation was observed in Mg-5.5Al during ageing at 175°C, 200°C, or 225°C, while both discontinuous and continuous precipitation occurred in Mg-8.9Al at the same ageing temperatures. Dilatometry curves showed that Mg-8.9Al expanded when aged at 225°C or 250°C. These results demonstrate that high content of Al is beneficial for discontinuous precipitation in binary Mg-Al alloys. Additional analyses indicated that the expansion of Mg-8.9Al during isothermal ageing can be attributed to the increment of the Mg cell lattice parameters. Moreover, continuous precipitation could suppress the discontinuous precipitation by reducing the driving force for growth of discontinuous precipitates.
AB - The precipitation behavior of Mg-Al alloys during isothermal ageing has been investigated by dilatometry. Only continuous precipitation was observed in Mg-5.5Al during ageing at 175°C, 200°C, or 225°C, while both discontinuous and continuous precipitation occurred in Mg-8.9Al at the same ageing temperatures. Dilatometry curves showed that Mg-8.9Al expanded when aged at 225°C or 250°C. These results demonstrate that high content of Al is beneficial for discontinuous precipitation in binary Mg-Al alloys. Additional analyses indicated that the expansion of Mg-8.9Al during isothermal ageing can be attributed to the increment of the Mg cell lattice parameters. Moreover, continuous precipitation could suppress the discontinuous precipitation by reducing the driving force for growth of discontinuous precipitates.
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85065546596&partnerID=8YFLogxK
U2 - 10.1007/s11837-019-03516-6
DO - 10.1007/s11837-019-03516-6
M3 - Journal articles
AN - SCOPUS:85065546596
VL - 71
SP - 2906
EP - 2912
JO - JOM: Journal of The Minerals, Metals & Materials Society
JF - JOM: Journal of The Minerals, Metals & Materials Society
SN - 1047-4838
IS - 8
ER -