Nanoindentation study of the effect of the structural state of the melt on the crystal structure and mechanical properties of the phases in an Al-50 wt % Sn alloy

Abstract

Abstract-Nanoindentation is used to measure Young's modulus, the hardness, the plasticity, and the yield strength of the phases in Al-50 wt % Sn alloy samples prepared by a traditional method and using liquid state homogenization. The effect of an increase in the cooling rate by an order of magnitude and alloying with 0.06 wt % Ti or 1 wt % Zr on the mechanical properties of the phases in the Al-50 wt % Sn alloy is studied. The most substantial effect on Young's modulus of the phases in the Al-50 wt % Sn alloy is found to be exerted by the homogenization of the metallic liquid and the introduction of zirconium in the alloy melt: the metal forming of an ingot is improved substantially.

Electrochemical performance and microstructural evolution of laser deposited Al‐Sn coating in acidic environment

“…This development has serious impact on the formed grains morphology. Increased rate of cooling had been re- ported to lead to improved microstructure [25]. The interplay between cooling rate increase and increased liquid heating during solidification led to enhanced microstructure.…”

Combined powder metallurgy routes to improve thermal and mechanical response of Al−Sn composite phase change materials

“…Among them, previous studies of Authors' research group focused on an Al-Sn alloy [7,8]. The Al-Sn system is a simple eutectic system, but, due to the low solid solubility of the two elements and the eutectic reaction temperature (228°C) close to pure Sn melting temperature (232°C), it can be considered as a metastable MGA [9,10]. The transition temperature of this PCM is assumed almost equal to pure Sn melting temperature and so, according to the PCM classification of Zhou et al [4], it belongs to the class of medium-temperature PCMs (150÷500°C).…”

“…The Authors chose this system because, using a simple binary alloy, it is possible to obtain a PCM with transition temperature slightly higher than the maximum temperatures achievable with polymeric PCMs. Further, in addition to its functional properties, this system was selected by the Authors because it had been widely applied in bearing alloys [10][11][12][13] and, so, the development of a production process to obtain the same alloy with a completely different application could be based on traditional industrial processes.…”

“…A common issue of MGAs is that solidification of casted MGAs results in the high-melting phase surrounded by the lower-melting one [10,11]. Considering Al-Sn systems, this is caused by the significant differences between the two metals in melting temperature, as well as in density [10]. Among the possible solutions, powder metallurgy is a relatively simple and effective technique to obtain the desired structure.…”