Effect of Retrogression and Re-Aging Treatment on the Organization and Properties of Cast Aluminum Alloys

Abstract:

In this paper, Samples are subjected to tensile test, metallographic microscope observation, scanning electron microscopy (SEM) analysis for exploring the effect of different retrogression and re-aging (RRA) treatments on the organization and properties of casting aluminum alloy. Results show that after aging at 170°C for 10h ,then regression at 230°C for 10min ,finally aging at 170°C for 10h, tensile strength of the sample is 430.19MPa, elongation is 6.18%, compared with the sample aged at 170°C for 10h (The tensile strength was 426.78MPa, elongation was 3.68%). It demonstrated that through the RRA process, strength of sample can effectively maintain at a similar high level as the samples processed single-stage aging. Meanwhile, the elongation of the sample increase nearly 67.9%. The microstructure characterizations indicate that RRA treatment induced the formation and growth of rod-like T phase, and the T phase homogeneously dispersed in the matrix of alloy. This process is proposed to be the major reason for the improvement of ductility.

• Periodical: Advanced Materials Research (Volumes 850-851)
• Pages: 144-147
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.850-851.144
• Online since: December 2013
• Authors: Xin Huang, Xiao Yan Zhang, Juan Juan Wu, Lei Fan
• Keywords: Casting Aluminum Alloy, Organisation, Property, Re-Aging Treatment, Retrogression

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