Analyzing the Effects of Milling and Sintering Parameters on Crystalline Phase Evolution and Mechanical Properties of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 Amorphous Ribbons

doi:10.1007/s40195-021-01341-y

Abstract

Abstract:

In the present study, Al₈₆Ni₈Y₆ and Al₈₆Ni₆Y_4.5Co₂La_1.5 bulk amorphous nanocomposites were synthesized by spark plasma sintering of milled melt spun ribbon particles. The as-cast ribbons were of near amorphous nature with minute amount of FCC Al embedded in the amorphous matrix. Milling of the ribbons resulted in partial devitrification due to mechanical crystallization. The milled ribbon particles were sintered in the temperature and pressure range of 300-500 °C and 500-700 MPa, respectively. It was observed that nominal amount of amorphous phase was retained at 500 °C and 500 MPa. With increase in sintering pressure and decrease in sintering temperature, the amount of crystalline phase evolution decreased, and maximum amount of amorphous phase was retained at 300 °C and 700 MPa. The microstructure consisting of amorphous phase embedded with hard intermetallic phases led to increase in the nanohardness of Al₈₆Ni₈Y₆ and Al₈₆Ni₆Y_4.5Co₂La_1.5 as-cast ribbons from 3.26 ± 0.59 GPa and 3.81 ± 0.58 GPa to 6.06 ± 0.70 GPa and 6.14 ± 0.82 GPa, respectively, for the corresponding consolidated amorphous nanocomposite. Microhardness of the three and five component system bulk samples was 4.19 ± 0.13 GPa and 3.6 ± 0.13 GPa, respectively.

Key words: Amorphous alloy, Milled ribbon, Spark plasma, Sintering, Nanohardness, Intermetallic compound

Ashutosh Sahu, Ram Sajeevan Maurya, Lavish Kumar Singh, Tapas Laha. Analyzing the Effects of Milling and Sintering Parameters on Crystalline Phase Evolution and Mechanical Properties of Al₈₆Ni₈Y₆ and Al₈₆Ni₆Y_4.5Co₂La_1.5 Amorphous Ribbons[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 1043-1054.

Figures/Tables 11

Fig. 1 XRD patterns of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 melt spun ribbons and 5 h milled ribbon particles

Fig. 2 SAED pattern and HRTEM images of a, c Al86Ni8Y6, b, d Al86Ni6Y4.5Co2La1.5 melt spun ribbons and e, g Al86Ni8Y6, f, h Al86Ni6Y4.5Co2La1.5 5 h milled ribbon particles

Fig. 3 DSC thermograms of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 a, b as-cast ribbons c, d milled ribbon particles, revealing various stages of phase transition

Table 1 Transition temperatures of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 as-cast ribbons and related milled ribbon particles at different heating rates

Composition	Sample	Heating rate (°C/min)	T_x1 (ºC)	T_x2 (ºC)	T_x3 (ºC)
Al₈₆Ni₈Y₆	As-cast ribbon	10	181	303.2	335
	As-cast ribbon	40	191.5	323	358
	Milled ribbon particles	10	-	300.2	343
	Milled ribbon particles	40	-	320.9	361
Al₈₆Ni₆Y_4.5Co₂La_1.5	As-cast ribbon	10	173	323	361
	As-cast ribbon	40	185	337	380
	Milled ribbon particles	10	-	315	365.5
	Milled ribbon particles	40	-	328	381

Fig. 4 XRD patterns of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 amorphous nanocomposites spark plasma sintered at different sintering parameters

Fig. 5 Back scattered diffraction images of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 amorphous nanocomposites spark plasma sintered at a, c 500 °C and 500 MPa, b, d 400 °C and 600 MPa and e, f 300 °C and 700 MPa revealing crystalline phases in the amorphous matrix and porosities marked by the arrows

Fig. 6 SAED pattern and HRTEM image of a, c Al86Ni8Y6 and b, d Al86Ni6Y4.5Co2La1.5 spark plasma sintered samples revealing evolution of various crystalline phases in the amorphous matrix

Fig. 7 DSC thermograms of consolidated a Al86Ni8Y6 b Al86Ni6Y4.5Co2La1.5 amorphous nanocomposites at different heating rates

Fig. 8 Variation of nanohardness and elastic modulus with indentation depth of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 as-cast ribbons and corresponding spark plasma sintered samples

Table 2 Average nanohardness (H) and elastic modulus (E), and corresponding H/E ratio of the as-cast ribbons and sintered samples

Sample	H (GPa)	E (GPa)	H/E
Al₈₆Ni₈Y₆ as-cast ribbon	3.26 ± 0.59	62.69 ± 10.89	0.052
Consolidated Al₈₆Ni₈Y₆ sample	6.06 ± 0.70	79.79 ± 6.33	0.076
Al₈₆Ni₆Y_4.5Co₂La_1.5 as-cast ribbon	3.81 ± 0.58	68.04 ± 7.4	0.056
Consolidated Al₈₆Ni₆Y_4.5Co₂La_1.5 sample	6.14 ± 0.82	84.11 ± 12.01	0.073

Fig. 9 Variation of microhardness with indentation load for the spark plasma sintered Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 amorphous nanocomposites

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Analyzing the Effects of Milling and Sintering Parameters on Crystalline Phase Evolution and Mechanical Properties of Al₈₆Ni₈Y₆ and Al₈₆Ni₆Y_4.5Co₂La_1.5 Amorphous Ribbons

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