The effect of alloy addition on the high temperature properties of over-aged Al-Si(CuNiMg) cast alloys

Cho, Young-Hee, Joo, Dae-Heon, Kim, Chul-Hyun and Lee, Hu-Chul (2006). The effect of alloy addition on the high temperature properties of over-aged Al-Si(CuNiMg) cast alloys. In: Materials Science Forum. 10th International Conference on Aluminum Alloys, Vancouver, BC., Canada, (461-466). 9-13 July 2006.

Author Cho, Young-Hee
Joo, Dae-Heon
Kim, Chul-Hyun
Lee, Hu-Chul
Title of paper The effect of alloy addition on the high temperature properties of over-aged Al-Si(CuNiMg) cast alloys
Conference name 10th International Conference on Aluminum Alloys
Conference location Vancouver, BC., Canada
Conference dates 9-13 July 2006
Proceedings title Materials Science Forum   Check publisher's open access policy
Journal name Aluminium Alloys 2006, Pts 1 and 2   Check publisher's open access policy
Place of Publication Switzerland, Germany
Publisher Trans Tech Publications
Publication Year 2006
Sub-type Fully published paper
ISBN 0-87849-408-1
ISSN 0255-5476
Volume 519-521
Issue PART 1
Start page 461
End page 466
Total pages 6
Language eng
Abstract/Summary The role of alloying elements in the improvement of the high temperature strength of Al-12Si(CuNiMg) cast alloys used for automotive piston applications was investigated. The addition of alloying elements such as Mn, Cr, Ti and Ge was studied and the detailed characterization of the composition and morphology of the constituent phases after over aging at 350 for 1000 hrs was performed. The compositions and volume fractions of the equilibrium phases determined by thermodynamic calculation were compared with the experimental results. The addition of transition elements, including Mn, Cr and Ti, increased the volume fraction of the intermetallic phases, which effectively enhanced the high temperature strength of the alloys. Among these transition elements, Mn turned out to be the most effective alloying element. After adding up to 0.5wt% of Mn, a large number of intermetallic phases, α-Al(Mn,Fe)Si as well as fine Al6(Mn,Fe) particles were precipitated and a significant improvement in the elevated temperature properties was achieved. The addition of Ge promoted the precipitation of the θphase (metastable phase, θ-Al2Cu), due to the formation of GeSi precipitates, thereby improved the mechanical properties of the alloy after T6 heat treatment. However, the presence of these GeSi precipitates did not affect the coarsening of the θ phase to form Qphase( Al5Cu2Mg8Si6) during aging and, thus, the elevated temperature properties were not improved by the addition of Ge.
Subjects 091207 Metals and Alloy Materials
Keyword Al-Si
High Temperature Properties
Intermetallic Compounds
Q-Index Code E1
Additional Notes Volume title: Aluminium Alloys 2006, PTS 1 and 2 - Research through innovation and technology.

Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Mon, 02 Mar 2009, 12:48:43 EST by Ms Sarada Rao on behalf of Materials