Low-temperature superplasticity in aluminum alloys processed by equal-channel angular pressing

Satoshi Ota, Hiroki Akamatsu, Koji Neishi, Minoru Furukawa, Zenji Horita, Terence G. Langdon

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2364-2369
Number of pages6
JournalMaterials Transactions
Volume43
Issue number10
DOIs
Publication statusPublished - Oct 2002

Fingerprint

superplasticity
Equal channel angular pressing
Superplasticity
pressing
aluminum alloys
Aluminum alloys
elongation
Elongation
Temperature
strain rate
Strain rate
Ternary alloys
Grain refinement
ternary alloys
Tensile testing
melting points
temperature
Melting point
Thermodynamic stability
thermal stability

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Ota, S., Akamatsu, H., Neishi, K., Furukawa, M., Horita, Z., & Langdon, T. G. (2002). Low-temperature superplasticity in aluminum alloys processed by equal-channel angular pressing. Materials Transactions, 43(10), 2364-2369. https://doi.org/10.2320/matertrans.43.2364

Low-temperature superplasticity in aluminum alloys processed by equal-channel angular pressing. / Ota, Satoshi; Akamatsu, Hiroki; Neishi, Koji; Furukawa, Minoru; Horita, Zenji; Langdon, Terence G.

In: Materials Transactions, Vol. 43, No. 10, 10.2002, p. 2364-2369.

Research output: Contribution to journalArticle

Ota, S, Akamatsu, H, Neishi, K, Furukawa, M, Horita, Z & Langdon, TG 2002, 'Low-temperature superplasticity in aluminum alloys processed by equal-channel angular pressing', Materials Transactions, vol. 43, no. 10, pp. 2364-2369. https://doi.org/10.2320/matertrans.43.2364
Ota, Satoshi ; Akamatsu, Hiroki ; Neishi, Koji ; Furukawa, Minoru ; Horita, Zenji ; Langdon, Terence G. / Low-temperature superplasticity in aluminum alloys processed by equal-channel angular pressing. In: Materials Transactions. 2002 ; Vol. 43, No. 10. pp. 2364-2369.
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