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 language | English |
|---|---|
| Pages (from-to) | 180-188 |
| Number of pages | 9 |
| Journal | Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals |
| Volume | 52 |
| Issue number | 2 |
| Publication status | Published - Feb 1988 |
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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 journal › Article
}
TY - JOUR
T1 - COMBINED EFFECT OF SOLUTION AND DISPERSION HARDENINGS AT HIGH TEMPERATURE.
AU - Nakashima, Hideharu
AU - Iwasaki, Koji
AU - Goto, Shoji
AU - Yoshinaga, Hideo
PY - 1988/2
Y1 - 1988/2
N2 - 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.
AB - 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.
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M3 - Article
AN - SCOPUS:0023963503
VL - 52
SP - 180
EP - 188
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 2
ER -