A calorimetric analysis of the precipitation reactions in AlSi1MgMn alloy with Cu additions


Birol Y.

THERMOCHIMICA ACTA, vol.650, pp.39-43, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 650
  • Publication Date: 2017
  • Doi Number: 10.1016/j.tca.2017.02.004
  • Journal Name: THERMOCHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.39-43
  • Keywords: Aluminum alloys, Heat treatment, Microstructure, Differential scanning calorimetry, MG-SI ALLOYS, MECHANICAL-PROPERTIES, EXTRUDED STOCK, AA6082, TRANSMISSION, STABILITY, FORGINGS, CAST
  • Dokuz Eylül University Affiliated: Yes

Abstract

The DSC spectrum of the AlSi1MgMn alloy with 0.05 wt% Cu confirms the well established precipitation sequence for ternary Al-Mg-Si alloys: supersaturated solid solution -> GP zones -> beta" -> beta' -> beta. The precipitation activities are displaced to lower temperatures with increasing Cu concentration. Additional Cu -bearing metastable precipitates, L, Q and theta, are evidenced by the change in the peak configuration in the DSC spectra of Cu -added AlSilMgMn alloys. The following precipitation sequences; SSSS -> GP -> theta' -> L -> beta" -> Q' -> beta' -> beta/Q/theta and SSS -> GP -> theta" ->theta' -> L -> beta" -> beta'-> beta/theta offer a plausible account of the revised peak configurations in the DSC spectra of the AlSiMgMn alloy with 0.15 wt% Cu and with at least 0.3 wt% Cu, respectively. (C) 2017 Elsevier B.V. All rights reserved.