Direct Observation of the Interaction of Dislocations with θ' Precipitates in an Aluminium-3.8 wt.-% Copper Alloy
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概要
- 論文の詳細を見る
The distribution of dislocations in an aluminium-3.8 wt.-% copper alloy, aged for 4 days at 240℃ to develop θ' precipitates and deformed by various amounts before thinning, has been examined by transmission electron microscopy. During observation, frequent movement of dislocations occurred, as a result of the stress caused by local heating from the electron beam, and various interactions were observed between dislocations and precipitates under different conditions. Thus, on arriving at a precipitate particle, a dislocation may : (i) be held up ; (ii) avoid the precipitate by cross-slip ; (iii) shear through the precipitate. Cases (ii) and (iii) were frequently observed as dislocation motion increased. In the specimen deformed by 1-2%, most of the dislocations were arrested by precipitates, on which striations were observed parallel to <110> directions. In another specimen deformed 5%, numerous tangled dislocations and dislocation loops were seen around the precipitates and in the matrix. In the light of these results, the slip processes occurring in this alloy are discussed in relation to strain-hardening.
- 東北大学の論文
著者
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Koda Shigeyasu
The Research Institute For Iron Steel And Other Metals
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Matsuura Keisuke
The Research Institute For Iron Steel And Other Metals
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TAKAHASHI Susumu
The Research Institute for Iron, Steel and Other Metals
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Takahashi Susumu
The Research Institute For Iron Steel And Other Metals
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