Comparison among the local atomic order of amorphous TM-Ti alloys (TM=Co, Ni, Cu) produced by Mechanical Alloying studied by EXAFS

TL;DR

This study uses EXAFS to analyze the local atomic structure of amorphous TM-Ti alloys (TM=Co, Ni, Cu) produced by Mechanical Alloying, revealing how chemical short-range order varies with different transition metals.

Contribution

It provides a comparative analysis of local atomic arrangements in TM-Ti alloys with different transition metals using EXAFS, highlighting changes in atomic pair distances and order.

Findings

Shortening of TM-Ti pairs with increasing d-electron difference

Increase in chemical short-range order from Co to Cu alloys

Coordination numbers and interatomic distances characterized

Abstract

We have investigated the local atomic structure of amorphous TM-Ti alloys (TM = Co, Ni, Cu) produced by Mechanical Alloying by means of EXAFS analyses on TM and Ti K-edges. Coordination numbers and interatomic distances for the four alloys where found and compared. EXAFS results obtained indicated a shortening in the unlike pairs TM-Ti as the difference between $d$ electrons of TM and Ti atoms increases, suggesting an increase in the chemical short range order (CSRO) from TM = Co to Cu.