电磁铸造铝合金的疲劳性能及差热分析

Fatigue Characteristics and Differential Scanning Calorimetry Investigation of the Electromagnetic Casting Aluminum Alloy

使用扫描电镜、透射电镜、X射线衍射仪和差热分析仪等设备对比观察了电磁铸造和普通连续铸造2024铝合金铸态及热处理状态的显微组织和力学性能。与普通连续铸造铸锭相比,电磁铸造铸锭的铸态及热处理状态的力学性能都有提高。通过观察差热分析曲线发现,电磁铸造试样具有较高热焓,说明其在加热过程中有更多沉淀强化物形成。而普通连续铸造铸锭尽管经过热处理仍然不能达到电磁铸造试样的性能。

SEM, TEM, XRD and DSC etc were carried out to contrast the microstructure and mechanical characteristics of EMC and DCC 2024 aluminum alloy before and after heat treatment Compared to DCC ingot, the EMC ingot has better mechanical properties not only in ascast condition but also in asaged one DSC curves show that the EMC specimens have high enthalpy that means much more precipitation formed during the heating process Even though after heat treatment, the DCC ingot still can not get the same quality as EMC one 