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Hardening Response to Rapid Aging Processes and Precipitation in Al-7%Si-0.3%Mg Alloy

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ICAA13 Pittsburgh

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Abstract

An orthogonal test was designed to obtain a optimized rapid aging process in order to shorten aging time. Hardness and tensile tests and TEM observation were used to evaluate the hardening response to the rapid aging process. An optimized rapid aging process, 160°C2h+200°C2h, is obtained. Under this process, the alloy has an approximately equal hardness and strength to the conventional single stage peak aging process, but the aging time of the rapid aging process is remarkably shortened, only 16.7% of the conventional process. Compared with the conventional aging process, the number density of β″ precipitates formed during the rapid aging course is reduced, however, the amount of β′ precipitates is remarkably increased. Though the contribution of the β″ precipitates to hardening is reduced, that of the high density of β′ rod precipitates is considerably increased, thus the rapid aging process produces an approximately equal hardening effect to the conventional peak aging process.

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Author information

Authors and Affiliations

  1. School of Materials Science and Engineering, Southeast University, District of Jiangning, Nanjing, 211189, China

    Hengcheng Liao, Yuna Wu & Ke Ding

  2. Jiangsu Key Laboratory for Advanced Metallic materials, Campus of Southeast University, District of Jiangning, Nanjing, 211189, China

    Hengcheng Liao, Yuna Wu & Ke Ding

Authors
  1. Hengcheng Liao
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  2. Yuna Wu
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  3. Ke Ding
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Editor information

Editors and Affiliations

  1. Alcoa Technical Center, Pittsburgh, PA, USA

    Hasso Weiland (Technical Fellow) (Technical Fellow)

  2. Carnegie Mellon University, USA

    Anthony D. Rollett (Professor of Materials Science & Engineering, Chair of the International Committee) (Professor of Materials Science & Engineering, Chair of the International Committee)

  3. Alcoa Technical Center, USA

    William A. Cassada (Director) (Director)

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© 2012 TMS (The Minerals, Metals & Materials Society)

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Liao, H., Wu, Y., Ding, K. (2012). Hardening Response to Rapid Aging Processes and Precipitation in Al-7%Si-0.3%Mg Alloy. In: Weiland, H., Rollett, A.D., Cassada, W.A. (eds) ICAA13 Pittsburgh. Springer, Cham. https://doi.org/10.1007/978-3-319-48761-8_167

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