Supersaturated Ni-10 wt% Ti Alloys Fabricated by Mechanical Alloying and Plasma Spraying

Abstract

A supersaturated Ni-10Ti alloy powder was produced from Ni and Ti elemental powders by solid state synthesis utilizing high energy mechanical alloying with times up to 5 h. Then, the milled powders were deposited on AISI 304 stainless steel substrate using air plasma spraying (APS) process. The microstructure and phase composition of the products were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The results indicated that the coatings contain Ni–Ti supersaturated solid solution and small amounts of oxides. The microhardness value for the deposited layer was comparable to that of as-milled powder. Further investigation showed that the corrosion performance of Ni-10Ti coating was comparable to that of AISI 304 stainless steel substrate.

Keywords:

• Characterization
• Corrosion
• Microstructure
• Milling
• Ni-10Ti
• Processing
• Supersaturated
• Synthesis