Ni-Based Metallic Glass Composites Containing Cu-Rich Crystalline Nanospheres

doi:10.1007/s40195-018-0756-y

Abstract

Abstract:

In this work, a quaternary Ni-Cu-Nb-Ta system has been designed to obtain composite microstructure with spherical crystalline Cu-rich particles embedded in amorphous Ni-rich matrix. The alloy samples were prepared by using single-roller melting-spinning method. The microstructure and thermal properties of the as-quenched alloy samples were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and differential scanning calorimetry. It shows that the spherical crystalline Cu-rich particles are embedded in the amorphous Ni-rich matrix. The average size of the Cu-rich particles is strongly dependent upon the Cu content. The effect of the alloy composition on the behavior of liquid-liquid phase separation and microstructure evolution was discussed. The phase formation in the Ni-based metallic glass matrix composite was analyzed.

Key words: Phase separation, Immiscible alloys, Metallic glass matrix composites, Ni-based metallic glasses, Cu-rich nanoparticles

Yao-Yao Xi, Jie He, Xiao-Jun Sun, Wang Li, Jiu-Zhou Zhao, Hong-Ri Hao, Ting Xiong. Ni-Based Metallic Glass Composites Containing Cu-Rich Crystalline Nanospheres[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(11): 1130-1134.

Figures/Tables 10

Table 1 Nominal compositions (at.%) of the alloy samples studied in this work

Alloys	Ni	Cu	Nb	Ta
N1	62.5	0	31.25	6.25
N2	55	12	27.5	5.5
N3	53.75	14	26.875	5.375
N4	52.5	16	26.25	5.25
N5	50.625	19	25.3125	5.0625
N6	48.75	22	24.375	4.875
N7	46.875	25	23.4375	4.6875

Fig. 1 SEM image of the solidified N7 alloy ingot after arc melting

Fig. 2 XRD patterns of the rapidly solidified N1-N7 alloy ribbons

Fig. 3 SEM images of the cross sections of a N4, b N7 alloy ribbons

Fig. 4 The relationship among the Cu content and the particle size and volume fraction

Fig. 5 STEM image of the as-quenched N7 alloy ribbon

Fig. 6 Pseudo-binary section of the liquid-state miscibility gap of the (Ni0.625Nb0.3125Ta0.0625)100-xCux alloy

Fig. 7 DSC scans of the as-quenched N1, N3, N5 and N7 alloy ribbons. The subscripts H and C mean heating and cooling at a rate of 20 K/min, and CP indicates Cu-rich particles

Fig. 8 SEM images of a the N1 alloy, b the Ni-rich region in the N7 alloy ingots, a small solubility of Ta is detected in NbNi3 and Ni6Nb7

Fig. 9 HRTEM images of a the interface between the Cu-rich particle and the matrix and b the Cu-rich particle in the as-quenched N7 alloy ribbon. The insets are FFT pattern a1 obtained from the matrix indicated by index A in a, a2 FFT pattern obtained from the particle indicated by index B in a

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