Synthesis of amorphous/crystalline composite using electroless copper plated amorphous powder

✍ Scribed by Yoon B. Kim; H.M. Park

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 393 KB
• Volume: 396
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2005.01.035

✦ Synopsis

An amorphous/crystalline composite was synthesized by warm extrusion of copper-deposited Ni 57 Zr 20 Ti 18 Si 3 Sn 2 amorphous powder. Electroless plating method was applied to deposit crystalline copper on Ni 57 Zr 20 Ti 18 Si 3 Sn 2 amorphous powder after fabricating Ni 57 Zr 20 Ti 18 Si 3 Sn 2 amorphous powder by gas-atomization technique. Fully amorphous Ni 57 Zr 20 Ti 18 Si 3 Sn 2 powder with a supercooled liquid region of 58 K could be obtained in the particle size range below 75 m. Uniform deposition of crystalline copper on the Ni 57 Zr 20 Ti 18 Si 3 Sn 2 amorphous powders was successfully performed by electroless plating. The optimum processing conditions for extrusion were obtained from the time-temperaturetransformation curve determined by isothermal annealing of Ni 57 Zr 20 Ti 18 Si 3 Sn 2 amorphous powder. The extruded amorphous/crystalline composite shows plasticity after yielding and exhibits a strength level of 1.3 GPa and plastic stain of about 3% under compressive condition. While monolithic bulk Ni 57 Zr 20 Ti 18 Si 3 Sn 2 amorphous alloy fabricated under same extrusion condition shows no plastic deformation.