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Materials 2017, 10(9), 1100;

Precipitation Behavior and Quenching Sensitivity of a Spray Deposited Al-Zn-Mg-Cu-Zr Alloy

School of Materials Science and Engineering, Central South University, Changsha 410083, China
School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, China
Department of Materials Science and Engineering, College of Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Author to whom correspondence should be addressed.
Received: 17 August 2017 / Revised: 17 September 2017 / Accepted: 17 September 2017 / Published: 19 September 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Precipitation behavior and the quenching sensitivity of a spray deposited Al-Zn-Mg-Cu-Zr alloy during isothermal heat treatment have been studied systematically. Results demonstrate that both the hardness and the ultimate tensile strength of the studied alloy decreased with the isothermal treatment time at certain temperatures. More notably, the hardness decreases rapidly after the isothermal heat treatment. During isothermal heat treatment processing, precipitates readily nucleated in the medium-temperature zone (250–400 °C), while the precipitation nucleation was scarce in the low-temperature zone (<250 °C) and in the high-temperature zone (>400 °C). Precipitates with sizes of less than ten nanometers would contribute a significant increase in yield strength, while the ones with a larger size than 300 nm would contribute little strengthening effect. Quenching sensitivity is high in the medium-temperature zone (250–400 °C), and corresponding time-temperature-property (TTP) curves of the studied alloy have been established. View Full-Text
Keywords: spray deposition; microstructure; aluminum alloys; strength; precipitation spray deposition; microstructure; aluminum alloys; strength; precipitation

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Sheng, X.; Lei, Q.; Xiao, Z.; Wang, M. Precipitation Behavior and Quenching Sensitivity of a Spray Deposited Al-Zn-Mg-Cu-Zr Alloy. Materials 2017, 10, 1100.

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