Experimental examination of measurement techniques of threshold stress for high-temperature deformation of dispersion-strengthened alloy

Fuyuki Yoshida, Junji Sugamoto, Hideharu Nakashima, Hideo Yoshinaga

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In order to clarify the problems involved in the measurement of the threshold stress for high-temperature deformation in a dispersion-strengthened alloy, using an Al-1.5 vol% Be alloy in which the strengthening mechanism has been identified, the threshold stress was measured by four different techniques: tensile test, stress relaxation test, creep test and stress abruptly loading test. The measured values were compared with the Orowan stress and the void-hardening stress calculated from dispersion parameters. The yield stress obtained from the tensile test at room temperature was higher than the Orowan stress: the proportional limit was about 1.3 times and the 0.2% proof stress was about 3 times. For the stress relaxation test, no clear zero-creep stress was observed at high temperatures and the approximately determined zero-creep stress strongly depended on temperature, decreasing as temperature rose. The threshold stress obtained from the creep test agreed approximately with the void-hardening stress of the slightly higher Orowan stress than the void-hardening stress. The threshold stress at high temperatures, 623 and 673 K, obtained from the stress abruptly loading test decreased from the Orowan stress to the void-hardening stress as the time elapsed under load. From these results, the problems in the measurement of threshold stress are discussed and the stress abruptly loading technique is recommended.

Original languageEnglish
Pages (from-to)613-620
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume58
Issue number6
DOIs
Publication statusPublished - 1994

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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