Method for determination of susceptibility to shrinkage of Al alloys was developed. With this method we can help our selves at design of new castings and feeding systems. Results of this method can be also used for optimization of casting simulation and interpretation of simulation results. Castings of this method were made and analyzed by X-ray analysis, thermal analysis was made and castings were cut to look inside to determine shrinkage porosity.
COBISS.SI-ID: 982879
The purpose of the presented paper was to examine the oxidation of Mg-Al alloys in the atmosphere of oxygen at various temperatures. The basic examination methods used were differential scanning calorimetry (DSC) and thermogravimetry (TG). The latter is based on recording the change of sample mass as a function of temperature. The results show that the oxide layer can either protect the material against progressive oxidation or it can cause complete disintegration of material. The nature of oxide layer depends on the external conditions.
COBISS.SI-ID: 909151
Mg alloys are usually used at room temperatures but and at higher temperatures and oxidizing atmospheres in different stages of processing, such as: overheating of the charge, melting, casting, heat treatment, etc. But those conditions result undesirable effects that change chemical properties and deteriorate structural properties of the surface layers. Therefore the knowledge of oxidation of Mg-alloys at different temperatures is important. Mg alloys: AE42, AZ91, AM50, and AM60 were exposed to oxidation at different temperatures in order to determinate high-temperature oxidation resistance.
COBISS.SI-ID: 1105759
The process is based on the infiltration of melt in the pores of ceramic foam which acts as the hardening phase. The casting process, mould dimension, preheating of ceramic foam or mould, pouring temperature, isolation thermal cover and vibration allow perfect filling of pores with melt. The gravity casting is used. Typical for this process is that during the casting and solidification the entire system vibrates.
COBISS.SI-ID: 15730454