研究目的
Investigating the use of laser flash analysis (LFA) for in situ precipitation monitoring in aluminium alloys by following thermal diffusivity, and comparing it with differential scanning calorimetry (DSC) and transmission electron microscopy to improve the interpretation of superimposed reactions.
研究成果
The LFA method was successfully adapted for in situ analysis of precipitation and dissolution reactions in aluminium alloys during continuous heating. The comparison with DSC data improved the interpretation of superimposed reactions. The study demonstrated the sensitivity of thermal diffusivity to microstructural changes and the influence of alloying elements on thermal and electrical conductivity.
研究不足
The study is limited by the need for temperature calibration and thermal lag correction for accurate measurements. The interpretation of thermal diffusivity data is complicated by the superposition of temperature changes and microstructural reactions.
1：Experimental Design and Method Selection:
The LFA method was adapted for non-isothermal conditions to allow continuous heating experiments. Methods for temperature calibration and thermal lag correction were developed.
2：Sample Selection and Data Sources:
The aluminium alloy EN AW-3105 [Al Mn0.5Mg0.5] in the as-cast condition was used. Samples were machined to specific dimensions for LFA and DSC experiments.
3：5Mg5] in the as-cast condition was used. Samples were machined to specific dimensions for LFA and DSC experiments.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: An LFA 467 HT HyperFlash device (Netzsch, Germany) equipped with a xenon flash lamp and an InSb IR detector was used. DSC experiments were performed using Setaram C600, Sensys, 121, and PerkinElmer DSC 8500 devices.
4：Experimental Procedures and Operational Workflow:
Continuous heating experiments were conducted at various heating rates. The LFA signal was corrected for temperature increases caused by the furnace. Temperature calibration and thermal lag correction were applied.
5：Data Analysis Methods:
The thermal diffusivity was calculated using the Cowan model. The derivative of the thermal diffusivity was analyzed to identify precipitation and dissolution reactions.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
