Abstract
Since the forming of the microstructure depends on the specific of the casting method, which directly affects further mechanical and physical properties of the material, it is important to understand how to control the microstructure of the cast to understand changes that taking place during the crystallisation process. For estimating the metallurgical quality of the liquid metal before casting, the thermal-derivative analysis (TDA) is utilised. The TDA has been used for a long time, in both ferrous and non-ferrous industries casting. The Universal Metallurgical Simulator and Analyser (UMSA) platform is a rapid, sensitive and economical method of determining a full range of solidification features. The work focuses on the thermal analysis and heat treatment of aluminium alloys. The liquidus and solidus temperatures and dendrite coherency point (DCP) are then characterised. The research shows that the UMSA platform allows precise determination and calculation of thermal parameters. The influence of the heat treatment on structure and properties of aluminium castings has been determined as well. Heat treatment was carried out to increase the mechanical properties of aluminium alloys. Based on the findings above, the influence of microstructure on properties of the alloys is discussed.
Highlights
Aluminium–magnesium casting alloys have a wide range of application, especially in the automotive and shipborne industry that is directly related to their good mechanical properties [1, 2]
It can be stated that the microstructure in the as-received state consists of three phases: a-Al, Al3Mg2 and Mg2Si which forms near grain boundaries (Fig. 2b)
One can see that the dendrite arm spacing (DAS) and grain size increased after thermal analysis in comparison with as-received or heat-treated state
Summary
Aluminium–magnesium casting alloys have a wide range of application, especially in the automotive and shipborne industry that is directly related to their good mechanical properties [1, 2]. Keywords Thermal-derivative analysis Á Dendrite coherency point Á Heat treatment Á Structure Á Aluminium alloy Á Tensile properties
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