COMBINED EFFECT OF SOLUTION AND DISPERSION HARDENINGS AT HIGH TEMPERATURE.

Hideharu Nakashima, Koji Iwasaki, Shoji Goto, Hideo Yoshinaga

Research output: Contribution to journalArticle

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Abstract

In order to clarify the combined effect of solution and dispersion hardening at high temperature, the internal stress, effective stress and dislocation density in Al-3 mol% Mg-1 mol%Mn alloy have been compared with Al-3 mol%Mg alloy. The measurement has been carried out by the stress-relaxation technique to steady state tensile deformation at temperatures from 573 to 723 K and strain rates from 3 multiplied by 10** minus **5 S** minus **1 to 3 multiplied by 10** minus **3 s** minus **1. It is found that the additive rule of hardening by solute Mg atoms and dispersed Al//6Mn particles holds in the low Z region, but the effect of dispersion hardening decreases with the increase of Z, the Zener-Hollomon parameter. This behavior is explained by the relative value of the inter-dislocation spacing to the inter-dispersoid spacing. In the low Z region where the dislocation spacing is larger than the dispersoid spacing, nearly all dislocations undergo the resistance of dispersoids and the additive rule holds. In the high Z region, the dislocation spacing becomes smaller than the dispersoid spacing, and the part of dislocations not directly contacting the dispersoids increases as Z increases, resulting in a decrease in the effect of dispersion hardening.

Original languageEnglish
Pages (from-to)180-188
Number of pages9
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume52
Issue number2
Publication statusPublished - Feb 1988

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Dispersion hardening
hardening
spacing
Stress relaxation
Temperature
Hardening
Strain rate
Residual stresses
tensile deformation
Atoms
stress relaxation
strain rate
residual stress
solutes

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

COMBINED EFFECT OF SOLUTION AND DISPERSION HARDENINGS AT HIGH TEMPERATURE. / Nakashima, Hideharu; Iwasaki, Koji; Goto, Shoji; Yoshinaga, Hideo.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 52, No. 2, 02.1988, p. 180-188.

Research output: Contribution to journalArticle

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