Effect of precipitation hardening on strain rate sensitivity and yield behaviour in an Al-Mg-Si alloy

✍ Scribed by H.J. Harun; P.G. McCormick

• Publisher: Elsevier Science
• Year: 1979
• Weight: 471 KB
• Volume: 27
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(79)90067-1

✦ Synopsis

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 which increased with increasing ageing time. For longer ageing times Au Ald remained positive at all strains. Serrated yielding was found to occur in samples where Au Alnl < 0. The results are discussed in terms of recent models for dynamic strain ageing based on the diffusion of solute atoms to temporarily arrested dislocations.