作成者 |
|
|
|
本文言語 |
|
出版者 |
|
|
発行日 |
|
収録物名 |
|
巻 |
|
号 |
|
開始ページ |
|
終了ページ |
|
出版タイプ |
|
アクセス権 |
|
JaLC DOI |
|
関連DOI |
|
|
|
|
関連URI |
|
|
|
|
関連情報 |
|
|
|
|
概要 |
Electron microfractography was used in order to clarify the role of precipitates and /or inclusions on ductile fracture of an aged Al-1.29%Si alloy. The results obtained are as follows. (1) The most ...tough state of the alloy was obtained at early aged state. The fractured surface was characterized by large dimples with very wavy appearance, which correlate with large inclusions. Therfore it was concluded that fine precipitates contribute to hardening of the alloy, but not to nucleation of dimples in this aging state. (2) At the aged state with maximum strength, high density regions of fine precipitates were localized and two types of group of dimples were observed on the fractured surface. In one type large dimples were associated with large inclusions, while in the other fine dimples were initiated at finer precipitates. This state is considered to correspond to a critical condition in size and distribution of precipitates for dimple initiation. (3) In over-aged state uniformly distributed precipitates grew up, its density decreased and ductility of the alloy recovered. The fractured surface showed finely distributed dimples with smooth appearance. The precipitates in this state were considered to contribute to the dimple nucleation rather than to its growth.続きを見る
|