アルミニウム中に含まれる微量の鉄の再結晶時における析出

長浜 勝介; 三木 功

doi:10.2464/jilm.20.137

長浜勝介, 三木功

著者情報

ジャーナルフリー

1970 年 20 巻 3 号 p. 137-144

DOI https://doi.org/10.2464/jilm.20.137

詳細

発行日: 1970/03/31 受付日: 1969/12/17 J-STAGE公開日: 2008/07/23 受理日: - 早期公開日: - 改訂日: -
訂正情報
訂正日: 2008/07/23 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : It is well known that a small amount of iron, usually contained in commercial aluminum and its alloy as an impurity, has great effects on grain size and aggregate structure after recrystallization. However, its mechanism remains still unsolved.
The activation energy of self-diffusion of the iron atom in aluminum was estimated to be 38.1±0.5 kcal/mol by one of the authors¹⁾ (Miki). The value was comparatively higher than that of aluminum or copper in aluminum. The sluggishness of the behavior of the iron atom such as diffusion and precipitation in aluminum and the stability of iron compounds were explained by the above fact.
According to Hirano et al²⁾., iron atom is likely to diffused through dislocations by pipe diffusion under certain conditions. Then, the precipitation of iron compound is expected to be accelerated by the increase of dislocation density in aluminum matrix by means of deformation.
The object of this study was to examine the precipitation of iron compound from deformed super-saturated aluminum matrix during recovery and recrystallization by means of hardness and electric resistivity measurements and by direct observation of thin films by an electron mircoscope. The alloys used were Al-0.043wt%Fe and Al-0.043wt%Fe-0.056wt%Si.
The results obtained are summarized as follows:
1) Precipitation of iron compound was accelerated by cold working and its rate was proportional to the degree of cold working. The acceleration was especially evident at the early stage of recrystallization process, and it occurred in the both processes of nucleation and crystal growth.
2) Retardation of the recrystallization process was observed. It would be attributed to the pinning ofsubboundaries by the precipitates, which were formed within the boundaries at the early stage of recrystallization.
3) The precipitates of iron compound, which had been formed during the recrystallization, was observedby an electron microscope, and were identified as Al₃Fe by diffraction patterns. The precipitates in this case were in globular form, quite different from those observed in undeformed specimens. They were not homogeneously distributed and their sizes were classified into two groups. The larger ones (0.5several microns) were supposed to be nucleated within subboundaries or grain boundaries. The smaller ones (less than 0.1μ) were supposed to be nucleated on dislocation lines.
Right : It is well known that a small amount of iron, usually contained in commercial aluminum and its alloy as an impurity, has great effects on grain size and aggregate structure after recrystallization. However, its mechanism remains still unsolved.
The activation energy of self-diffusion of the iron atom in aluminum was estimated to be 38.1±0.5 kcal/mol by one of the authors¹⁾ (Miki). The value was comparatively higher than that of aluminum or copper in aluminum. The sluggishness of the behavior of the iron atom such as diffusion and precipitation in aluminum and the stability of iron compounds were explained by the above fact.
According to Hirano et al²⁾., iron atom is likely to diffused through dislocations by pipe diffusion under certain conditions. Then, the precipitation of iron compound is expected to be accelerated by the increase of dislocation density in aluminum matrix by means of deformation.
The object of this study was to examine the precipitation of iron compound from deformed super-saturated aluminum matrix during recovery and recrystallization by means of hardness and electric resistivity measurements and by direct observation of thin films by an electron mircoscope. The alloys used were Al-0.043wt%Fe and Al-0.043wt%Fe-0.056wt%Si.
The results obtained are summarized as follows:
1) Precipitation of iron compound was accelerated by cold working and its rate was proportional to the degree of cold working. The acceleration was especially evident at the early stage of recrystallization process, and it occurred in the both processes of nucleation and crystal growth.
2) Retardation of the recrystallization process was observed. It would be attributed to the pinning of subboundaries by the precipitates, which were formed within the boundaries at the early stage of recrystallization.
3) The precipitates of iron compound, which had been formed during the recrystallization, was observed by an electron microscope, and were identified as Al₃Fe by diffraction patterns. The precipitates in this case were in globular form, quite different from those observed in undeformed specimens. They were not homogeneously distributed and their sizes were classified into two groups. The larger ones (0.5several microns) were supposed to be nucleated within subboundaries or grain boundaries. The smaller ones (less than 0.1μ) were supposed to be nucleated on dislocation lines.

訂正日: 2008/07/23 訂正理由: - 訂正箇所: 発行日訂正内容: 訂正前 : 19700330
訂正後 : 19700331

訂正日: 2008/07/23 訂正理由: - 訂正箇所: 引用文献情報訂正内容: Wrong : 1) I. Miki and H. Warlimont: Z. Metallkde., 59 (1968) 254.
2) K. Hirano, R. P. Agarwala and M. Cohen: Acta Met., 10 (1962), 857.
3) D. Altenpohl: Aluminium and Aluminium-legierungen, p. 408~424, Springer (1965), Berlin.
4) R. W. Cahn: Recrystallization, Grain Growth and Texture, p. 99, A. S. M. Seminar (1965)
5) I. Miki and H. Warlimont: Z. Metallkde., 59 (1968), 408.
6) R. H. Bush, C. A. Stickels and W. Hobbs: Scripta Met., 1 (1967), 75.
8) U. Köster and E. Hornbogen: Z. Metallkde., 59 (1968), 792.
9) U. Köster and E. Hornbogen: 5 Internationale Leichtmetalltagung, Leoben (1968).
10) K. Lücke and K. Detert: Acta Met., 5 (1957) 628.
11) E. S. Machlin : Trans. AIME., 224 (1962), 1153.
12) J. W. Cahn : Acta Met., 10 (1962 ), 789.
13) K. Lücke and H. P. Stove: Recovery and Recrystallization of Metals, p. 171, Interscience (1963).
14) P. Gordon and R. A. Vandermeer: Recovery and Recrystallization of Metals, p. 211 (1963)
15) R. D. Dopherty and J. Martin: Trans. ASM., 57 (1964), 874.
16) F. Haessner, E. Hornbogen and M. Mukherjee: Z. Metallkde, 57 (1966), 171.
17) J. E. Brimhall, M.J. Klein and R. A. Huggins: Acta Met., 14 (1966), 459.
18) F. J. Humphreys and J. W. Martin: Acta Met., 14 (1966), 775.
19) P. R. Mould and P. Cotterill: J. Mater. Sci., 2 (1967), 241.

Right : 1) I. Miki and H. Warlimont: Z. Metallkde., 59 (1968) 254.
2) K. Hirano, R. P. Agarwala and M. Cohen: Acta Met., 10 (1962), 857.
3) D. Altenpohl: Aluminium und Aluminiumlegierungen, p. 408-424, Springer (1965), Berlin.
4) R. W. Cahn: Recrystallization, Grain Growth and Texture, p. 99, A. S. M. Seminar (1965).
5) I. Miki and H. Warlimont: Z. Metallkde., 59 (1968), 408.
6) R. H. Bush, C. A. Stickels and W. Hobbs: Scripta Met., 1 (1967), 75.
8) U. Köster and E. Hornbogen: Z. Metallkde., 59 (1968), 792.
9) U. Köster and E. Hornbogen: 5 Internationale Leichtmetalltagung, Leoben (1968).
10) K. Lücke and K. Detert: Acta Met., 5 (1957) 628.
11) E. S. Machlin : Trans. AIME., 224 (1962), 1153.
12) J. W. Cahn : Acta Met., 10 (1962 ), 789.
13) K. Lücke and H. P. Stüve: Recovery and Recrystallization of Metals, p. 171, Interscience (1963).
14) P. Gordon and R. A. Vandermeer: Recovery and Recrystallization of Metals, p. 211 (1963)
15) R. D. Dopherty and J. Martin: Trans. ASM., 57 (1964), 874.
16) F. Haessner, E. Hornbogen and M. Mukherjee: Z. Metallkde, 57 (1966), 171.
17) J. E. Brimhall, M.J. Klein and R. A. Huggins: Acta Met., 14 (1966), 459.
18) F. J. Humphreys and J. W. Martin: Acta Met., 14 (1966), 775.
19) P. R. Mould and P. Cotterill: J. Mater. Sci., 2 (1967), 241.

訂正日: 2008/07/23 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

抄録

It is well known that a small amount of iron, usually contained in commercial aluminum and its alloy as an impurity, has great effects on grain size and aggregate structure after recrystallization. However, its mechanism remains still unsolved.
The activation energy of self-diffusion of the iron atom in aluminum was estimated to be 38.1±0.5 kcal/mol by one of the authors¹⁾ (Miki). The value was comparatively higher than that of aluminum or copper in aluminum. The sluggishness of the behavior of the iron atom such as diffusion and precipitation in aluminum and the stability of iron compounds were explained by the above fact.
According to Hirano et al²⁾., iron atom is likely to diffused through dislocations by pipe diffusion under certain conditions. Then, the precipitation of iron compound is expected to be accelerated by the increase of dislocation density in aluminum matrix by means of deformation.
The object of this study was to examine the precipitation of iron compound from deformed super-saturated aluminum matrix during recovery and recrystallization by means of hardness and electric resistivity measurements and by direct observation of thin films by an electron mircoscope. The alloys used were Al-0.043wt%Fe and Al-0.043wt%Fe-0.056wt%Si.
The results obtained are summarized as follows:
1) Precipitation of iron compound was accelerated by cold working and its rate was proportional to the degree of cold working. The acceleration was especially evident at the early stage of recrystallization process, and it occurred in the both processes of nucleation and crystal growth.
2) Retardation of the recrystallization process was observed. It would be attributed to the pinning of subboundaries by the precipitates, which were formed within the boundaries at the early stage of recrystallization.
3) The precipitates of iron compound, which had been formed during the recrystallization, was observed by an electron microscope, and were identified as Al₃Fe by diffraction patterns. The precipitates in this case were in globular form, quite different from those observed in undeformed specimens. They were not homogeneously distributed and their sizes were classified into two groups. The larger ones (0.5several microns) were supposed to be nucleated within subboundaries or grain boundaries. The smaller ones (less than 0.1μ) were supposed to be nucleated on dislocation lines.

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