Non-isothermal ageing of an Al–8Zn–2Mg–2Cu alloy for enhanced properties
作者： J.T. Jiang , Q.J. Tang , L. Yang , K. Zhang , S.J. Yuan
DOI: 10.1016/J.JMATPROTEC.2015.07.018
关键词:
摘要: Abstract Excellent mechanical properties and satisfactory corrosion resistance were achieved in an Al–Zn–Mg–Cu alloy via non-isothermal ageing (NIA) treatment. The precipitation age-strengthening elucidated by combining the TEM observing, DSC analysis testing results. was evaluated based on measured electrical conductivity. effect of staring temperature (Ts) cooling rate (Rc) NIA processes systematically investigated. continuously decreasing is found inhibit existing precipitates’ coarsening also induces secondary precipitation. High Ts low Rc bring about high conductivity hardness. Extra hardening together with a decrease occurs at later stage due to forming fine precipitates. strength combined can be obtained setting 180–190 °C range 10–20 °C/h range. An optimized process (cooled from 190 100 °C 20 °C/h) provides higher comparable SCC within halved processing time looking typical T74 as reference.
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