Fabrication of Nano-Structured Ni-Cu Solid Solution Alloys by Mechanical Alloying |
Paper ID : 1404-UFGNSM-FULL |
Authors: |
Abstract: |
Ni-Cu alloys generally exhibit good resistance to corrosion and stress corrosion cracking in a variety of environments. These alloys are commonly fabricated in bulk by melting processes. However, by the use of mechanical alloying (MA) process, a nano-structured powder product can be produced with low cost and unique properties. In this study, Cu and Ni elemental powder mixtures containing 25, 50, and 75 at% Cu were subjected to mechanical alloying (MA) in a planetary ball mill under various milling times. The structural evolution during mechanical alloying was characterized by means of X-ray diffractometry (XRD) and scanning electron microscopy (SEM). Experimental results indicate that nano-structured solid solution with single-phase and homogeneous distribution of Ni and Cu has been prepared through interdiffusion mechanism. Average crystallite size of as-milled powders was decreased with increasing Ni content and increasing milling time, and found to be in the order of 15-40 nm after 30 h of milling for all powder compositions. Moreover, lattice constant and lattice strain of solid solutions were increased during mechanical alloying. |
Keywords: |
Mechanical Alloying, Nano-Structured, Solid Solution, Ni-Cu Binary Alloys |
Status : Paper Accepted (Poster Presentation) |