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首页> 外文期刊>Journal of Materials Science >Non-isothermal precipitation kinetics and its effect on hot working behaviors of an Al-Zn-Mg-Cu alloy
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Non-isothermal precipitation kinetics and its effect on hot working behaviors of an Al-Zn-Mg-Cu alloy

机译：非等温沉淀动力学及其对Al-Zn-Mg-Cu合金的热工作行为的影响

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摘要

The precipitation kinetics and its effect on hot working behavior of an Al-Zn-Mg-Cu alloy were studied under non-isothermal conditions and over a wide range of temperatures. The characterization techniques employed included in situ electrical resistivity measurements, differential scanning calorimetry, hardness testing and microstructure examination by scanning and transmission electron microscopy. The results showed that the precipitation kinetics during non-isothermal treatments were highly dependent on the thermal paths. Slow cooling processes led to coarse and sparse particle distribution. When heating to high temperatures, very fine precipitates with high density and homogeneous distribution were present at low temperature. Such fine precipitates showed unstable characters and dissolved quickly at higher temperature. Quantification of precipitate evolution during non-isothermal processing was obtained from in situ electrical resistivity measurements. The effects of heating paths on dynamic and static flow behaviors were also demonstrated to be significant. The degree of initial supersaturation controlled the nucleation rates and led to strong effect on dynamic and static precipitation, and on the flow stress softening.
机译：在非等温条件下和各种温度下，研究了沉淀动力学及其对Al-Zn-Mg-Cu合金的热工作行为的影响。采用的表征技术包括在原位电阻率测量，差示扫描量热法，硬度测试和微观结构检查通过扫描和透射电子显微镜。结果表明，非等温处理期间的沉淀动力学高度依赖于热路径。缓慢冷却过程导致粗糙和稀疏的颗粒分布。加热至高温时，在低温下存在具有高密度和均匀分布的非常细的沉淀物。这种细沉淀物显示出不稳定的特性并在较高温度下快速溶解。从原位电阻率测量中获得非等温处理期间沉淀蒸馏的量化。加热路径对动态和静态流动行为的影响也表明是显着的。初始过饱和度控制了成核速率，并导致对动态和静态沉淀的强烈影响，以及流量胁迫软化。

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