Amorphous phase formation in a Ni−Zr−Al−Y alloy system

Abstract

Quaternary Ni-based amorphous alloys containing only metallic elements were developed through systematic alloy design. The importance of the phase equilibria information for the development of amorphous alloys was demonstrated through experimental results. Ni-Zr-Al ternary alloys having low liquidus temperature tend to have high GFA. Partial replacements of Zr with Y in the ternary alloys significantly enhanced the GFA of the quaternary alloys. The alloy Ni 60 Zr 25 Al 8 Y 7 could be cast into a fully amorphous rod through an injection casting method. Since most Ni-based amorphous alloys reported to date contain non-metallic elements, the Ni-based amorphous alloys developed in the alloy system Ni-Zr-Al-Y are of interest.

Effect of Ni Addition on the Glass Forming Ability and Mechanical Properties in Cu<SUB>60</SUB>Zr<SUB>22</SUB>Ti<SUB>18</SUB> Metallic Glass Alloy

“…Since the late 1980s, bulk metallic glasses (BMGs) in the form of rod more than 1 mm in diameter have been developed in the Pd-, Zr-, Cu-, Ti-, Fe-and Ni-based alloy systems. [2][3][4][5][6][7] Recently, BMGs such as Cu-, Ti-, Fe-, and Ni-based alloys have been attracting much attention because the base materials are commercial elements. Among these alloy systems, Cu-based BMGs, in particular, have been constantly reported in Cu-Zr, Cu-(Zr,Hf)-Ti, Cu-Zr-Ti-Ni, Cu-Zr-Ti-(Y,Be), Cu-Zr-Al, Cu-Zr-Al-(Ag, Y) systems, with their GFA being enhanced from 1 mm to 10 mm diameter.…”

Deformation behavior of Zr-based bulk metallic glass in an undercooled liquid state under compressive loading

“…Transition metal based multi-component alloy systems have been found to vitrify in various bulk forms since they were first reported in 1990 [1][2][3][4]. The "bulk" metallic glasses are very important for both scientific studies and industrial applications.…”

Estimation of critical cooling rates for glass formation in bulk metallic glasses through non-isothermal thermal analysis

“…These alloys were selected because they show different ranges of critical cooling rates from 0.1 to about ~100 K/s [1,4]. Ca65Mg15Zn20 and Mg65Cu25Y10 alloys were prepared by induction melting high purity elements (99.9 %) in BN coated graphite crucibles under an Ar atmosphere, followed by casting the liquid into a cone-shaped copper mold with dimensions of 6 mm in diameter at the bottom, 15 mm in diameter at the top and 45 mm in height.…”

“…Several thermal parameters have been proposed to reflect GFA [1][2][3]: reduced glass transition temperature, Trg (=Tg/TL, where Tg and TL are glass transition and liquidus temperature, respectively); range of supercooled liquid region, ΔTx (=Tx−Tg, where Tx is the onset temperature of crystallization during heating a glass); and parameter γ (=Tx/(Tg+TL)). In general, GFA of an alloy is expected to increase with increasing the magnitude of these parameters [3,4], even though there are some examples showing exceptional cases [5,6]. The GFA can be expressed either by the critical cooling rate (Rc) for glass formation or the maximum-sectioned thickness (Zc) of bulk metallic glass (BMG) [7][8][9][10][11][12][13][14][15][16][17].…”