Al-Cu-Sn合金の粒界近接部におけるθ'相の析出

鈴木 寿; 菅野 幹宏; 荒木 一郎

doi:10.2464/jilm.26.427

Preciptitation of θ' phase adjacent to grain boundary in Al-Cu-Sn alloys

Hisashi SUZUKI, Motohiro KANNO, Ichiro ARAKI

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JOURNAL FREE ACCESS

1976 Volume 26 Issue 9 Pages 427-431

DOI https://doi.org/10.2464/jilm.26.427

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Published: September 30, 1976 Received: April 28, 1976 Available on J-STAGE: July 23, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 23, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : The region (D (θ') region) where finer θ' precipitates were formed densely was found adjacent to the grain boundary in Al-(24)wt%Cu-Sn alloys, when solution-treated, quenched and aged at 200250°Ç. In this report, the fbrmation of the D (θ') region in Al-Cu-Sn alloys was studied in relation to quenching conditions and solution-treatment temperatures (T_s) by using a transmission electron microscope. The results obtained are as follows.
(1) The D (θ') region was found to be caused by appearance of the region where Sn rich phases precipitated densely in the early stage of aging.
(2) The D (θ') region formed only under the condition of fast quenching (i. e. quenching into iced water). The width of D (θ') region and the distance from the grain boundary to D (θ') region increased with lowering T_s.
(3) These results would be explained from the following assumption: Atransient peak of vacancy concentration profile developes adjacent to the grain boundary in the early stage of aging, owing to the formation of secondary defects inside the grain.
Right : The region (D (θ') region) where finer θ' precipitates were formed densely was found adjacent to the grain boundary in Al-(24)wt%Cu-Sn alloys, when solution-treated, quenched and aged at 200250°Ç. In this report, the formation of the D (θ') region in Al-Cu-Sn alloys was studied in relation to quenching conditions and solution-treatment temperatures (T_s) by using a transmission electron microscope. The results obtained are as follows.
(1) The D (θ') region was found to be caused by appearance of the region where Sn rich phases precipitated densely in the early stage of aging.
(2) The D (θ') region formed only under the condition of fast quenching (i. e. quenching into iced water). The width of D (θ') region and the distance from the grain boundary to D (θ') region increased with lowering T_s.
(3) These results would be explained from the following assumption: A transient peak of vacancy concentration profile developes adjacent to the grain boundary in the early stage of aging, owing to the formation of secondary defects inside the grain.

Date of correction: July 23, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

The region (D (θ') region) where finer θ' precipitates were formed densely was found adjacent to the grain boundary in Al-(24)wt%Cu-Sn alloys, when solution-treated, quenched and aged at 200250°Ç. In this report, the formation of the D (θ') region in Al-Cu-Sn alloys was studied in relation to quenching conditions and solution-treatment temperatures (T_s) by using a transmission electron microscope. The results obtained are as follows.
(1) The D (θ') region was found to be caused by appearance of the region where Sn rich phases precipitated densely in the early stage of aging.
(2) The D (θ') region formed only under the condition of fast quenching (i. e. quenching into iced water). The width of D (θ') region and the distance from the grain boundary to D (θ') region increased with lowering T_s.
(3) These results would be explained from the following assumption: A transient peak of vacancy concentration profile developes adjacent to the grain boundary in the early stage of aging, owing to the formation of secondary defects inside the grain.

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