The influence of precipitation hardening on the characteristics of serrated yielding in an Al-IMg-Si alloy has been investigated. The critical strain at the onset of serrated yielding was increased by ageing and for ageing times longer than 6 hr at 180Β°C serrated yielding was not observed. The strai
The effect of iron on the precipitation in an Al-Mg-Si alloy
β Scribed by Dr. U. Schmidt; M. Joachimi; L. Petzold; Dr. F. Eichhorn
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 523 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0232-1300
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β¦ Synopsis
The effect of iron on the precipitation of a technical Al-Mg-Si alloy was studied by macroand microhardness, Y-modulus and SANS with D K D and was coinpared with a pure alloy. The iron phases of the technical alloy were preferentially considered by the SANS. I n addition the daniping by the elastomat of FORSTER and the variance of the microhardness were measured. It was found t h a t iron essentially influences the kinetics o f the precipitate, particularly the mechanism of nucleation and precipitation sequence. Der EinfluB von Eisen auf die Ausscheidungsltinetik einer technischen AlMgSi-Legierung wird durch Vergleich mit einer reinen AlMgSi-Legierung untersucht. Als MelJverfahren komirien Makro-und Mikroharte, Y-Modul und Neutronenkleinwinkelstreuung mit einem D K D zur Anwendung. Die NKWS spricht bevorzugt auf d.ie Eisenphasen in der technischen Legierung an. Zusatzlich wurde die Danipfung am FORSTER-Elastomaten und fur die Mikrohartemessungen das Streuquadrat ausgewertet. Es konnte nachgewiesen werden, dal.3 Eisen den Ausscheidungsmechanismus in der AlMgSi-Legierung wesentlich beeinflulJt, insbesondere den Keimbildnngsmechanisrnus und der Sequenzfolge.
π SIMILAR VOLUMES
The effects of precipitation hardening on the stram rate sensitlvlty of the flow stress and the yield behaviour in an Al-Mg-Si allo) have been investigated. In samples aged for less than 4 h at 160 C measurements of Au Alti were found to decrease with increasing strain. becommg negative at a strain
The effect of discontinuous increases in strain rate on the yield behavior of specimens undergoing type A serrated yielding has been investigated. Above a critical increase in strain rate, a transition in the subsequent yield behavior, from further type A yielding to continuous yielding was observed