J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (3): 193-198.

• Reviews •    下一篇

The Influence of Cold Deformation on the Ageing Behaviour of Aluminium - 4 wt% Copper Alloy

SwarupKumarGhosh   

  1. Bengal Engineering & Science University, Shibpur
  • 收稿日期:2009-04-21 修回日期:2010-10-06 出版日期:2011-03-28 发布日期:2011-03-21
  • 通讯作者: SwarupKumarGhosh

Influence of Cold Deformation on the Aging Behaviour of Al-Cu-Si-Mg Alloy

S.K. Ghosh   

  1. Department of Metallurgy and Materials Engineering, Bengal Engineering and Science University, Shibpur, Howrah 711103, India
  • Received:2009-04-21 Revised:2010-10-06 Online:2011-03-28 Published:2011-03-21
  • Contact: Swarup KumarGhosh

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摘要： The present study concerns the effect of cold deformation and subsequent ageing on the microstructure and mechanical properties of 4 wt% copper bearing aluminium alloy. Differential scanning calorimetry indicates that precipitation occurs in the temperature range of 258 – 272oC for the as quenched wrought alloy without cold deformation. 45% cold deformation prior to ageing triggered the precipitation reaction at a temperature ~ 82oC with pronounced decrease in the activation energy values from 106 to 33 kJ/mol. Ageing treatment after cold deformation improves hardness, tensile strength with a concomitant reduction in total elongation. Microstructural investigations have revealed the formation of fine precipitates within matrix after ageing of the cold deformed sample.

Abstract: The present study deals with the effect of cold deformation and subsequent aging on the microstructure and mechanical properties of Al-Cu-Si-Mg alloy. Differential scanning calorimetry indicates that precipitation occurs in the temperature range of 258−272°C for the as quenched wrought alloy. The activation energy value estimated by Kissinger method for the aforesaid precipitation reaction is obtained as 106 kJ/mol. 45% cold deformation prior to aging indicates the first dissolution reaction at about 50°C and the precipitation reaction at a temperature of about 82°C. Microstructural investigations have revealed the formation of fine precipitates within the matrix after aging of the cold deformed sample. As-quenched alloy reveals prominently the aging
response. The increase in hardness, yield and tensile strength with simultaneous decrease in elongation in the deformed alloy is found to be primarily due to the deformation strengthening and not due to the precipitation hardening.

Key words: Aluminium alloy, Aging, Cold deformation, Differential scanning calorimetry, Kissinger method