Thermodynamic description of the Al–Ag–Zr system and discovery of the high-strength ternary phase Al1.84Ag0.16Zr.

Autor:	Deng, Zixuan, Ding, Yanjun, Masset, Patrick J., Wang, Kaige, Zhang, Ligang, Liu, Libin
Předmět:	TRANSMISSION electron microscopy HEAT resistant alloys MECHANICAL alloying PHASE diagrams
Zdroj:	Journal of Materials Science; Jul2023, Vol. 58 Issue 25, p10516-10538, 23p, 6 Diagrams, 6 Charts, 9 Graphs
Abstrakt:	The investigation of the Al–Ag–Zr system is crucial for the development of heat-resistant Al alloys, which are essential for applications in high-temperature environments. In this work, we first determined the isothermal sections of the Al–Ag–Zr system at 500 and 600 °C using equilibrium alloys. Simultaneously, the τ3 (Al6AgZr6) phase was identified by transmission electron microscopy (TEM). In addition, the three-phase equilibrium of τ3 + AgZr + (Ag) instead of Al3Zr4 + AgZr + (Ag) was confirmed at 500 and 600 °C. The formation enthalpies of the end-members and ternary compounds in the Al–Ag–Zr system were calculated via first-principles calculations. Based on the experimental and computational results, a thermodynamic database of the Al–Ag–Zr system was established using the CALPHAD (calculation of phase diagrams) method. The hardness of τ1 (Al2.68Ag0.32Zr) and τ2 (Al1.84Ag0.16Zr) were determined to be 3.82 and 10.20 GPa, respectively, using nanoindentation. The introduction of the τ2 phase in the design of Al alloys can considerably increase the mechanical properties of the alloys. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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