The effect of simple metal (Al, Ga) addition on the crystallisation and density of amorphous Zr-Ni alloys
A K Bhatnagar; K W Rhie; D G Naugle; A Wolfenden; B H Zhang; T O Callaway; W D Bruton; C -R Hu; A K Bhatnagar; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; K W Rhie; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; D G Naugle; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; A Wolfenden; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; B H Zhang; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; T O Callaway; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; W D Bruton; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; C -R Hu; Dept. of Phys., Texas A&M Univ., College Station, TX, USA
Журнал:
Journal of Physics: Condensed Matter
Дата:
1990-03-19
Аннотация:
Amorphous metal ribbons of (Zr<sub>0.64</sub>Ni<sub>0.36</sub>)<sub>1-x</sub>M<sub>x</sub> where M=Al, Ga and (Zr<sub>0.5</sub>Ni<sub>0.5</sub>)<sub>1-x</sub>Al<sub>x</sub> for values of x between 0 and 0.25 have been prepared by a rapid quenching technique of melt spinning. The effect of adding Al or Ga to Zr<sub>0.64</sub>Ni<sub>0.36</sub> and Zr<sub>0.5</sub>Ni<sub>0.5</sub> is to increase the crystallisation temperature of both host alloys. The effect of Al or Ga substitution on the thermal stability of (Zr<sub>0.64</sub>Ni<sub>0.36</sub>)<sub>1-x</sub>M<sub>x</sub> is very similar. At a composition between x=0.05 and 0.10, the M component completely suppresses the transformation to intermediate phases that has been observed in the crystallisation process for amorphous Zr-Ni alloys in a small composition range near 64 at.% Zr. The density of (Zr<sub>0.64</sub>Ni<sub>0.36</sub>)<sub>1-x</sub>Al<sub>x</sub> and of (Zr<sub>0.5</sub>Ni<sub>0.5</sub>)<sub>1-x</sub>Al<sub>x</sub> decreases linearly while that of (Zr<sub>0.64</sub>Ni<sub>0.36</sub>)<sub>1-x</sub>Ga<sub>x</sub> remains almost constant with x. An extension to ternary and higher order alloys of the Buschow kinetic model predicting the crystallisation temperature of binary alloys is proposed.
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