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Correlation Between Electronic Structure, Mechanical Properties and Stability of TE-TL Metallic Glasses

Ramir Ristić ; Department of Physics, Josip Juraj Strossmayer University of Osijek, Trg Ljudevita Gaja 6, HR-31000 Osijek, Croatia
Emil Babić ; Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
Mirko Stubičar ; Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
Ahmed Kuršumović ; Department of Materials Science, Cambridge University, Pembroke Street, Cambridge CB2 3QZ, United Kingdom

Sažetak

Mechanical properties (Young's modulus and hardness) of TE-Ni,Cu (TE = Ti, Zr and Hf) amorphous alloys increase approximately linearly with Ni, Cu fraction, x, over a wide composition range (fraction of Ni, Cu atoms ≤ 66 %). This correlates with the observed increase of the Debye temperatures with x and shows that the strength of interatomic bonding increases with x in these alloys. The thermal stability (e.g. the crystallization temperatures) of these alloys also increases with x, thus with increasing interatomic bonding. Since in all these alloys the electronic density of states at the Fermi level, N(E_F), decreases linearly with x within the same x-range, a very simple relationship exists between the electronic structure and mechanical and thermal properties. We also estimate the mechanical properties of amorphous TEs (by extrapolating the properties of alloys to x = 0) and compare them with those of crystalline TEs.

Ključne riječi

metallic glasses; electronic structure; mechanical properties; thermal stability; transition metals

Hrčak ID:

52153

URI

https://hrcak.srce.hr/52153

Datum izdavanja:

30.4.2010.

Posjeta: 2.048 *