Low-temperature superplasticity in Al alloys processed by equal-channel angular pressing
Ota, Satoshi, Akamatsu, Hiroki, Neishi, Koji, Furukawa, Minoru, Horita, Zenji and Langdon, Terence G. (2002) Low-temperature superplasticity in Al alloys processed by equal-channel angular pressing. Materials Transactions, 43, (10), 2364-2369.
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Equal-channel angular pressing (ECAP) was applied to achieve grain refinement of Al–3 mass%Mg alloys containing 0.2 mass%Sc, 0.2 mass%Fe or 0.1 mass%Zr. The thermal stability of the fine-grained structures was examined by conducting static annealing experiments. The fine grain sizes produced by ECAP were essentially retained up to a temperature of 523 K for the Fe-containing and Zr-containing alloys and up to a temperature as high as 773 K for the Sc-containing alloy. The three alloys with Sc, Fe and Zr additions were pulled to failure in tension at 523 K corresponding to 0.59Tm, where Tm is the absolute melting point of the alloy, and maximum elongations of ∼ 640%, ∼ 370% and ∼ 390% were obtained at an initial strain rate of 3.3×10−4 s−1, respectively. Such elongations resulted in more than three times or approximately twice the elongation achieved in a binary Al–3%Mg alloy. It is shown that either Fe or Zr may be used as an alternative element in place of Sc to attain low temperature superplasticity. Tensile testing was also conducted on the Sc-containing ternary alloy at a temperature as low as 473 K corresponding to 0.54Tm. A maximum elongation of ∼ 420% was attained at an initial strain rate of 3.3×10−4 s−1. This appears to be the lowest homologous temperature reported to date for superplasticty of Al-based alloys.
|Keywords:||superplasticity, equal-channel angular pressing (ECAP), aluminum-magnesium alloys, submicrometer grains, tensile test|
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||12 Feb 2007|
|Last Modified:||02 Mar 2012 13:26|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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