Enhanced Mechanical Properties, Corrosion Behavior and Bioactivity of Ti-based Bulk Metallic Glasses with Minor Addition Elements

The alloying effects of the like-atom substitution of Ni and Co for Fe on the various properties of Fe 70 B 16.7-Si 8.3 Ta 5 metallic glass are investigated in this present work. New Fe-based bulk glassy alloys, namely Fe 60-x Co x Ni 10-B 16.7 Si 8.3 Ta 5 (at.%; x = 10, 20 and 30) with critical diameters up to 1.5 mm, were made by means of copper mold casting. A new glass-forming ability indicator, viz., the enthalpy of supercooled liquid, has been introduced for assessment of the glass-forming abilities (GFAs) of these Fe-based multi-component alloys. Nano-indentation results indicate that the calculated elastic modulus and hardness of the bulk glassy alloys are lower than those of the Fe 70 B 16.7 Si 8.3 Ta 5 alloy. Among these bulk glassy alloys, Fe 70 B 16.7 Si 8.3 Ta 5 exhibits the large elastic modulus and hardness with values of 178 ± 1 GPa and 12.9 ± 0.1 GPa, respectively. All the bulk glassy alloys exhibit good soft magnetic properties with high saturation magnetization B s * 0.75-1.04 T but low coercive force H c * 0.2-5.2 A/m.

“…As shown in Fig. 3, this proposition finds further support in the (Co,Fe)-B-Si-Nb and other bulk glassy alloys derived from like-atom substitution alloying [19,[21][22][23][24].…”

Section: Resultssupporting

confidence: 56%

Mechanical and Magnetic Properties of New (Fe,Co,Ni)–B–Si–Ta Bulk Glassy Alloys

Geng

Lin

Wang

et al. 2017

“…Compared with other typical metallic glasses, Ti-based metallic glasses show lower Young's moduli and good corrosion behavior [14]. Interestingly, Ti-based metallic glasses show formation of a metastable phase after the first crystallization process [15].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Relaxation of a Ti36.2Zr30.3Cu8.3Fe4Be21.2 Bulk Metallic Glass: Experiments and Theoretical Analysis

Qiao

Chen

Lyu

et al. 2018

The dynamic mechanical relaxation behavior of Ti 36.2 Zr 30.3 Cu 8.3 Fe 4 Be 21.2 bulk metallic glass with good glass-forming ability was investigated by mechanical spectroscopy. The mechanical relaxation behavior was analyzed in the framework of quasi-point defects model. The experimental results demonstrate that the atomic mobility of the metallic glass is closely associated with the correlation factor χ. The physical aging below the glass transition temperature T g shows a non-Debye relaxation behavior, which could be well described by stretched Kohlrausch exponential equation. The Kohlrausch exponent aging reflects the dynamic heterogeneities of the metallic glass. Both concentration of "defects" and atomic mobility decrease caused by the in situ successive heating during the mechanical spectroscopy experiments.

“…8). The possible deformation mechanism is that the shear bands of the amorphous matrix may be hindered by the nanocrystalline phases [64][65][66][67][68]. The nanoscale heterogeneity of the structure may be further enhanced during the plastic deformation [69].…”

Section: Discussionmentioning

confidence: 99%

In Situ Scattering Studies of Crystallization Kinetics in a Phase-Separated Zr–Cu–Fe–Al Bulk Metallic Glass

Liu

Ying

et al. 2021

Thermal stability and the crystallization kinetics of a phase-separated Zr-Cu-Fe-Al bulk metallic glass were investigated using in situ high-energy synchrotron X-ray and neutron diffraction, as well as small-angle synchrotron X-ray scattering. It was revealed that this glass with excellent glass-forming ability possesses a two-step crystallization behavior. The crystalline products and their evolution sequence are more complicated than a homogeneous Zr-Cu-Al glass with average glass-forming ability. The experimental results indicate that a finely distributed nanometer-sized cubic Zr 2 Cu phase forms first and then transforms to a tetragonal Zr 2 Cu phase, while the matrix transforms to an orthorhombic Zr 3 Fe phase. The strength of the Zr-Cu-Fe-Al composite containing cubic Zr 2 Cu phase and glass matrix increases, and the plasticity also improves compared to the as-cast Zr-Cu-Fe-Al bulk metallic glass. Our results suggest that the formation of multiple and complex crystalline products would be the characteristics of the Zr-Cu-Fe-Al glass with better glass-forming ability. Our study may shed light on the synthesis of bulk-sized glass-nanocrystals composites of high strength and good plasticity.