Effects of Cu and Ag additions on age-hardening behavior during multi-step aging in AlMgSi alloys
作者： JaeHwang Kim , Calin Daniel Marioara , Randi Holmestad , Equo Kobayashi , Tatsuo Sato
DOI: 10.1016/J.MSEA.2012.09.051
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摘要: Abstract Low Cu and Ag additions (≤0.10 at%) were found to strongly affect the age-hardening behavior in AlMgSi alloys with Mg+Si>1.5 at%. The hardness increased during aging at 170 °C formation of β ″ precipitates was kinetically accelerated. activation energy phase calculated 127, 105, 108 99 KJmol −1 base, Cu-added, Ag-added CuAg-added alloys, respectively using Kissinger method. negative effect two-step caused by Cluster (1) natural not overcome addition microalloying elements. However, it suppressed (2) through a pre-aging 100 °C. Quantitative analysis precipitate microstructure performed transmission electron microscope equipped parallel loss spectrometer for determination specimen thickness. increase number density precipitates, whereas decreased needle length. effects low combination multi-step are discussed based on observations resistivity measurements.
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