A New Ni-Based Metallic Glass with High Thermal Stability and Hardness

Metals

Aytekin Hitit¹  Hakan ᗪhin²  Pelin Öztürk²  Ahmet Malik Aşgın²  Jordi Sort Vi༚s² 

[1]Department of Materials Science and Engineering, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey

关键词: metallic glass;    refractory metal;    glass forming ability;    crystallization temperature;    microhardness;   

DOI  :  10.3390/met5010162

来源: mdpi

【 摘 要 】

Glass forming ability (GFA), thermal stability and microhardness of Ni_51−xCu_xW_31.6B_17.4 (x = 0, 5) metallic glasses have been investigated. For each alloy, thin sheets of samples having thickness of 20 µm and 100 µm were synthesized by piston and anvil method in a vacuum arc furnace. Also, 400 µm thick samples of the alloys were synthesized by suction casting method. The samples were investigated by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Crystallization temperature of the base alloy, Ni₅₁W_31.6B_17.4, is found to be 996 K and 5 at.% copper substitution for nickel increases the crystallization temperature to 1063 K, which is the highest value reported for Ni-based metallic glasses up to the present. In addition, critical casting thickness of alloy Ni₅₁W_31.6B_17.4 is 100 µm and copper substitution does not have any effect on critical casting thickness of the alloys. Also, microhardness of the alloys are found to be around 1200 Hv, which is one of the highest microhardness values reported for a Ni-based metallic glass until now.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.