Plastic Deformation of Electrodeposited Nanocrystalline Ni-W Alloys at High Temperatures

Hitoshi Yokoyama; Tohru Yamasaki; Takeyuki Kikuchi; Takeshi Fukami

doi:10.4028/www.scientific.net/MSF.561-565.1295

Paper Titles

Environment-Assisted Cracking of Zr-Based Bulk Metallic Glass
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Density and Enthalpy Relaxation Behavior in a Bulk Pd₄₀Ni₄₀P₂₀ Metallic Glass
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Ultrasonic Attenuation Properties of Glassy Alloys in Views of Complex Viscoelasticity
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Fabrication of Ni_52.5Nb₁₀Zr₁₅Ti₁₅Pt_7.5 Bulk Metallic Glassy Matrix Composite Containing Dispersed ZrO₂ Particulates by Spark Plasma Sintering
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Plastic Deformation of Electrodeposited Nanocrystalline Ni-W Alloys at High Temperatures
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Low Cycle Fatigue of Electrodeposited Pure Nanocrystalline Metals
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Comparison of Mechanical Properties between As-Quenched and Annealed Metallic Glass Pd₄₄Cu₃₁Ni₈P₁₇
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Small-Scale Resistance Spot Welding of Zr Based Glassy Alloys
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Origin of Different Dependence of Apparent Glass-Forming Ability on Casting-Atmosphere-Pressure in Zr-Al-Ni-Cu-Pd Alloy System
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Plastic Deformation of Electrodeposited Nanocrystalline Ni-W Alloys at High Temperatures

Abstract:

High-strength nanocrystalline Ni-W alloys containing 16.9 at. % W with average grain size of about 6 nm in diameter has been obtained by electrodeposition. At room temperature, the nominal tensile strength of the alloy was attained to about 1600 MPa, while the plastic strain before fracture was a very low value of 0.05 %. In this case, highly localized shear bands were observed near the fractured surface of the tensile test specimen. When the samples were annealed at 300 °C under a static tensile stress of 327 MPa, the plastic strain was largely increased at the initial period of annealing and then tended to saturate, i.e., 0.54 % for 2 h, respectively. Grain size of the Ni-W alloys was almost saturated to 10 ~ 15 nm after annealing at 300°C for 2 h. It may be expected that the high tensile stress during grain growth might be effective to obtain the large uniform plastic deformation of nanocrystalline Ni-W alloys.