Density of Al–Ni–Co-R (R = Nd, Gd, Yb) alloys in solid and liquid states

Structural Changes in Metallic Glass-Forming Liquids on Cooling and Subsequent Vitrification in Relationship with Their Properties

“…For Fe it corresponds well to a predicted one when volume of the liquid becomes similar to that of the competing crystalline phase [ 49 ]. In some glass-forming alloys, such as Cu 50 Zr 50 /(Cu 50 Zr 50 ) 95 Al 5 [ 50 ] and Al 86 Ni 4 Co 4 Gd 6 [ 51 ], glass transition takes place in accordance with this criterion. The glass-transition temperature ( T g ) of the Al 86 Ni 4 Co 4 Gd 6 alloy of 550 K measured by DSC on heating at relatively slow heating [ 52 ] corresponds quite well to that extrapolated from the density as a function of temperature curves for liquid and crystalline phases [ 51 ].…”

“…In some glass-forming alloys, such as Cu 50 Zr 50 /(Cu 50 Zr 50 ) 95 Al 5 [ 50 ] and Al 86 Ni 4 Co 4 Gd 6 [ 51 ], glass transition takes place in accordance with this criterion. The glass-transition temperature ( T g ) of the Al 86 Ni 4 Co 4 Gd 6 alloy of 550 K measured by DSC on heating at relatively slow heating [ 52 ] corresponds quite well to that extrapolated from the density as a function of temperature curves for liquid and crystalline phases [ 51 ]. The intersection of the tangents of the volume as a function of temperature curves in liquid and vitreous state of the Pd 43 Cu 27 Ni 10 P 20 melt suggests volumetric T g of 572 K and equivolume (liquid-crystal) temperature is 460 K [ 53 ] while vitrification takes place well above it.…”

Influence of rare earth metals on volumetric characteristics of Al-Ni-Co-R alloys in crystalline and liquid states

“…If nickel is used as a TM, then Al-Ni-R compositions demonstrate excellent mechanical properties in amorphous and nanocrystalline states, and when cobalt is used, amorphous Al-Co-R alloys exhibit high corrosion resistance. Previously we assumed that with simultaneous use of nickel and cobalt, it becomes possible to obtain the alloys with high mechanical and anticorrosion properties [18][19][20].…”

Role of rare-earth metals (R) in the appearance of relaxation processes in AL–Ni–R metal melts

“…During the investigation of the features of the structural state of melts and interparticle interaction in them, indirect methods are frequently used, which are based on studying temperature and concentration dependences of structure-sensitive properties of a melt such as viscosity, density, electrical resistance, magnetic susceptibility [11,[20][21][22]. The existing data on the investigation of the properties of melts of the binary Al-R [23][24][25][26][27], ternary Al-TM-R [28][29][30] and more complex systems based on them [30][31][32] confirm the conclusion about the micro-heterogeneous structure of the melts. It is also shown that after melting near the liquidus temperature the structure of the melts becomes more complex due to the appearance of the nonequilibrium state [12,[28][29][30].…”

“…The influence of the initial temperature of the melt on the structure and properties of amorphous alloys was shown. Later, such features were observed on the polytherms of other properties of liquid alloys, in particular density [31] and specific electrical resistance [24]. It was believed [12,31,35] that the nonequilibrium microheterogeneous state appearing in the Al-TM-R melts is metastable and its destruction is possible only at the overheating of the melt to a temperature that is higher than a certain temperature characteristic of each alloy (i.e.…”