Balancing benefits of strength, plasticity and glass-forming ability in Co-based metallic glasses

doi:10.1016/j.jmst.2021.01.042

Abstract

Abstract:

Development of advanced metals materials with ultrahigh strength, large plasticity and high thermostability is one of the most attractive aims for materials researchers. Co-based bulk metallic glasses (BMGs) with the highest strength (up to 6 GPa) and special strength (up to 650 Nm/g) among all of metals materials so far we known have received extensive attentions. In this paper, a family of Co-Ta-B-Si BMGs with high glass-transition temperature (above 870 K), large compressive plasticity (up to 6.4 %) and high strength (above 5.5 GPa), and high glass-forming ability (the critical diameter, D_c: up to 4 mm) was developed by accurately tuning metalloid element contents of Si and B in the parental alloy of Co₅₅Ta₁₀B₃₅. The changes of glass formation and plasticity caused by the adjustment of the constituent metalloid elements were evaluated by the combination of experimental and calculated results. The reason for the significant improvement of plastic deformation is revealed by the analysis of the self-organization behaviors of high-density shear bands.

Key words: Metallic glass, Glass formation, Thermostability, Strength, Plasticity

Yimeng Zhao, Xuan Li, Xiaobin Liu, Jiazi Bi, Yang Wu, Ruijuan Xiao, Ran Li, Tao Zhang. Balancing benefits of strength, plasticity and glass-forming ability in Co-based metallic glasses[J]. J. Mater. Sci. Technol., 2021, 86: 110-116.

Figures/Tables 9

Fig. 1. XRD patterns of the as-cast Co55Ta10B35-xSix (x?=?0, 2, 5) and Co55-yTa10B35-ySi2 (y?=?8) BMGs with the maximum diameters for glass formation.

Fig. 2. DSC curves for the as-cast Co55Ta10B35-xSix (x?=?0, 2, 5) and Co55-yTa10B35-ySi2 (y?=?8) BMGs at a heating rate of 0.33 k/s.

Table 1 Glass-forming ability, thermal parameters, elastic moduli, mechanical properties and other physical properties of Co55+ yTa10B35-x-ySix (x?=?0, 2, 5 @y?=?0 and x?=?2 @y?=?8) bulk metallic glasses.

Alloys	ρ (g/cm³)	D_c (mm)	T_g (K)	T_x (K)	T_m (K)	T_l (K)	ΔT_x (K)	T_rg	γ	E (GPa)	G (GPa)	B (GPa)	ν	σ_y (MPa)	σ_c (MPa)	ε_p (%)	H_v (GPa)
Co₅₅Ta₁₀B₃₅	8.912	1	966	1038	1442	1520	72	0.636	0.418	250	95	248	0.316	5891	6030	0.5	16.5
Co₅₅Ta₁₀B₃₃Si₂	9.242	3	920	988	1362	1384	68	0.665	0.429	241	92	235	0.310	5684	5817	3.3	15.9
Co₅₅Ta₁₀B₃₀Si₅	9.423	3	890	949	1290	1313	59	0.678	0.431	233	89	210	0.309	5544	5651	0.3	15.1
Co₆₃Ta₁₀B₂₅Si₂	9.326	4	870	918	1370	1398	48	0.622	0.405	227	85	224	0.335	5254	5519	6.4	15.3

Fig. 3. Partial pair correlation functions of Co55Ta10B35, Co55Ta10B33Si2, and Co63Ta10B25Si2 BMGs.

Fig. 4. Neighbor solute atom (B and Si) number distribution for B-centered clusters in Co55Ta10B35, Co55Ta10B33Si2, and Co63Ta10B25Si2 BMGs. The index <n> along the lateral axis denotes the atomic number of B and Si in B-centered cluster.

Fig. 5. (a) The stress-strain curve of Co55Ta10B35-xSix (x?=?0, 2, 5) and Co55-yTa10B35-ySi2 (y?=?8) BMGs under compressive mode. (b)-(e) SEM images of fracture-surface morphologies for the typical failed samples of Co55Ta10B33Si2 BMG.

Fig. 6. The relationship between Poisson's ratio and plastic strain of various BMG systems: (a) all kinds of BMGs including Co-, Fe-, Cr-, Hf-, Mg-, Pd-, Pt-, Zr-, Cu-, and Ni-based ones; (b) “brittle” BMGs including Co-, Fe-, Cr- and Mg-based ones.

Fig. 7. Stress-strain curves in plastic deformation stage for (a) Co55Ta10B35, (b) Co55Ta10B33Si2, and (c) Co63Ta10B25Si2 BMGs. The statistics of stress drops distribution for (d) Co55Ta10B35, (e) Co55Ta10B33Si2, and (f) Co63Ta10B25Si2 BMGs in plastic deformation stage of the stress-strain curves. (g) The schematic diagram of the formation and propagation of shear bands, and (g) the corresponding SEM image of the side-view morphology for Co63Ta10B25Si2 BMG after failure.

Fig. 8. (a) Relationship among GFA, strength and plasticity for our developed Co-based BMGs and other reported ones. (b) Relationship between Tg and plasticity for our developed Co-based BMGs and other reported ones. (Ⅰ) Co-Ta-B [5,7], (Ⅱ) Co-Fe-B-Si-Nb [17,48], (Ⅲ) Co-Fe-Ni-P-C-B [49], (Ⅳ) Co-Nb-B [16], (Ⅴ) Co-(Mo, W)-B [21,50], (Ⅵ) Co-Mo-P-B [51] and (Ⅶ) Co-Cr-Mo-C-B [22].

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