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Aushärtungsverhalten einer im halb‐erstarrten Zustand durch Squeeze‐Casting hergestellten Aluminiumlegierung A319
Author(s) -
Wang Q.F.,
Wang L.D.,
Zhu D.Y.,
Lin Z.,
Chen X.,
Sheng B.
Publication year - 2018
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201800037
Subject(s) - hardening (computing) , alloy , materials science , precipitation hardening , aluminium , metallurgy , microstructure , solid solution strengthening , transmission electron microscopy , composite material , layer (electronics) , nanotechnology
The influence of age hardening treatment on the hardness and microstructure of semi‐solid squeeze cast A319 alloy is investigated. At 175 °C, the age‐hardening curve of the alloy shows two peaks between which there was an apparent valley. Analyses by transmission electron microscopy, selected area electron diffraction and energy‐dispersive X‐ray detection suggest that the first peak is caused by formation of G.P.2 zones while the second peak can be related to formation of the metastable θ′‐ and Q′‐phases. Compared with gravity die cast A319 the semi‐solid squeeze cast A319 shows a larger increase and a higher peak in hardness during the age hardening process. Additionally, the latter requires another 32 h to reach the first hardness peak while it reaches the second hardness peak about 24 h earlier than the former.