Effect of powder diameter of Al-Fe powder extrusions on the resistivity obtained from Matthiessen empirical relation.
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A relation between resistivity at 77K (ρ77) and resistance ratio (R_??_ρ300/ρ77), induced from Matthiessen's Rule and empirically determined in commercial pure aluminium, was applied to Al-10%Fe powder extrusions degassed and extruded at 573K after N2 gas atomization and classification. ρM77 and Matthiessen size factor (M.F.=ρM77/Ω77 where Ω77 is resistance measured at 77K) were calculated from the R. Dependences of the ρM77 and the M.F. on average powder diameter and their change by isochronal heat treatments were investigated. It was considered from ρM77 that, even after the extrusion at 573K, solute Fe concentration was higher than maximum equilibrium solubility. Ratio of the M.F. to usual geometrical size factor (G.F.), M.F/G.F., was small in specimens of small average powder diameter. The M.F./G.F. decreased with decrease of the ρM77 due to precipitation of Fe in low temperature treatments, then increased before or with increase of the ρM77 due to re-solution of precipitates containing Fe at higher temperatures. In many cases of treatments, increase in the M.F./G.F. corresponded with the softening. Specmens of smaller powder diameter showed softening at lower temperatures. However, even in specimen of the smallest powder diameter, 36μm, almost no softening occured at 573K. Specimens of powder diameter larger than 108μm maintained their as-extruded hardness after holding for 600ks at 623K.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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