Cooperative Shear in Bulk Metallic Glass Composites Containing Metastable 
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-Ti Dendrites

Zhang, L.; Narayan, Ranjani; Sun, B. A.; Yan, Tingyi; Ramamurty, Upadrasta; Eckert, Jürgen; Zhang, H. F.

doi:10.1103/physrevlett.125.055501

Cited by 20 publications

(7 citation statements)

References 37 publications

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“…4. According to the recent research on the tensile serrated manner [27], only when the propagation length of shear bands is quite large, the materials can show serrated flow with stress drops and reloading stages. As seen in Fig.…”

Section: Discussionmentioning

confidence: 99%

Improved tensile plasticity of bulk metallic glasses by heightening microstructural heterogeneity and energy state

Ma¹,

Mei²,

Cui³

et al. 2021

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Bulk metallic glasses (BMGs) generally fail in a brittle manner at room temperature upon uniaxial tensile loading. In the present work, we disclose that high microstructural heterogeneity fabricated in high energy glass could obviously enhance the macroscopic tensile plasticity of BMGs. Such a unique structure can promote the lower formation energy and the dificulty to propagate shear bands, resulting in detectable yielding and certain tensile plasticity. This work may widen the pathway to overcoming the brittleness and is believed to aid in structural application of BMGs greatly. K e y w o r d s : bulk metallic glasses, tensile plasticity, high energy, microstructural heterogeneity

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Section: Discussionmentioning

confidence: 99%

Improved tensile plasticity of bulk metallic glasses by heightening microstructural heterogeneity and energy state

Ma¹,

Mei²,

Cui³

et al. 2021

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“…ere are several works studying on the mechanism of plastic deformation and strengthening behavior in the MGCs [15][16][17][18]. To provide some examples, Zhang et al [19] indicated that the stress-induced transformation of the crystalline phase in a Ti-based MG improved the strain hardening capability and the resistance to the main shear band propagation.…”

Section: Introductionmentioning

confidence: 99%

Role of Glass Composition on Mechanical Properties of Shape Memory Alloy‐Metallic Glass Composites

Chupradit

Raya

Huy

et al. 2021

Advances in Materials Science and Engineering

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In this work, the molecular dynamics (MD) simulation was applied to design a laminated composite structure comprised of the shape memory alloy (SMA) and Cu-Zr metallic glasses (MGs). A wide range of MG compositions was considered to tune the mechanical features and improve the homogenous plastic deformation during the tension loading. The results indicated that the martensitic transformation in the SMA inhibited the sudden shear band propagation in the composite for all the samples. Moreover, it was revealed that the mechanism of plasticity was significantly affected by the change of MG composition. In the Cu-rich MGs, the formation and propagation of thick shear bands occurred at the end of the tension loading; however, the increase in Zr content induced the interaction of multiple shear bands with finer configurations in the system. Nevertheless, the excessive Zr addition in the MG composition facilitated the aggregation of nanopores at the interface of SMA and MGs, which may be due to the softening effect in the Zr-rich MGs. Finally, it is concluded that an optimized MG composition is required for the trade-off between the plasticity and the strength in the SMA-MG composites.

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“…For instance, Zhang et al [11] have shown that compositional modifications of β-Ti dendrites lead to deformation induced martensitic transformations in them and improves their shear band arresting capabilities. Such transformation induced plasticity (TRIP) effects can be combined with microstructural optimization to obtain a BMGC that is simultaneously strong and ductile [11,51,83,[151][152][153][154] . While the ductility-fracture toughness scaling may indeed be true in crystalline alloys, no such connection exists in BMGs.…”

Section: Introductionmentioning

confidence: 99%

“…To enhance ductility, a composite approach is adopted, wherein a ductile crystalline phase is introduced in the BMG matrix [1, 3, 7, 9, 11, 12, 50, 57, 131, 137, 139-141, 151, 166]. One of the popular means of fabricating such BMG matrix composites (BMGCs) is to choose a composition that undergoes phase separation into amorphous and crystalline phases during solidification from the melt [7,9,11,12,50,131,137,139,140,151]. Of the several such BMGCs, the ones with β-Ti dendrites in a Zr/Ti-based metallic glass matrix are promising as they exhibit excellent ductility, without a significant trade-off in strength [8,9,11,12,150,151,161].…”

Section: Introductionmentioning

confidence: 99%

“…One of the popular means of fabricating such BMG matrix composites (BMGCs) is to choose a composition that undergoes phase separation into amorphous and crystalline phases during solidification from the melt [7,9,11,12,50,131,137,139,140,151]. Of the several such BMGCs, the ones with β-Ti dendrites in a Zr/Ti-based metallic glass matrix are promising as they exhibit excellent ductility, without a significant trade-off in strength [8,9,11,12,150,151,161]. Moreover, the size, volume fraction, and metastability of the dendrites can be tailored to achieve the desired combination of strength and ductility [11].…”

Section: Introductionmentioning

confidence: 99%

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Studies on fracture of bulk metallic glasses and their composites

Devashish¹

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Bulk metallic glasses (BMGs) possess incredible mechanical properties such as superior yield strength, high elastic strain limit, corrosion resistance, and good thermal and electrical conductivity. However, poor fracture toughness and nil ductility at room temperature limits their utility in structural applications. In order to alleviate the above mentioned drawbacks, secondary phases in the form of dendrites (in situ BMG matrix composite (BMGC)), particles or fibres (ex situ BMGC), and pores (porous BMG) are introduced. These secondary phases restrict shear band propagation and lead to proliferation of multiple shear bands in the BMG derivatives mentioned above.In this thesis, in order to assess the structural applicability of in situ BMGCs, first, fracture experiments have been conducted. Fracture behavior of in situ BMGCs containing both transforming and non-transforming β-Ti dendrites under shear and opening modes are examined.Experimental results show that the fracture toughness of all the tested BMGCs is considerably lower in mode II than in mode I, due primarily to the shear dominant stress state of the former, which renders easy shear band initiation. However, stable crack growth in mode I is insignificant whereas it is considerable in mode II. The toughness of BMGCs reinforced with coarse but non-transforming dendrites in both the modes is higher than the respective values in BMGCs with transforming β-Ti dendrites inspite of their ability to strain harden and exhibit enhanced ductility. Fracture surface features and shear band patterns at notch tips of both mode I and mode II specimens indicate that despite the interactions of dendrites with the shear bands, the fracture criterion and mechanism of in situ BMGCs is identical to that of monolithic BMGs.The differences in the fracture behaviour of these BMGCs is rationalized by considering the effect of relaxation enthalpy of the amorphous matrices in addition to the length scale and transforming tendency of the dendrites on the transition of a shear band into a crack. Implications of these results in terms improving the fracture toughness of BMGCs with transforming dendrites is discussed.iii First and foremost, I am very grateful to my supervisors, Prof. Parag Tandaiya and Prof.Upadrasta Ramamurty, for their unwavering support, motivation, and guidance during my PhD.Both have my heartfelt gratitude for their keen interest in this work and passionate participation in every aspect of it. Prof. Parag Tandaiya's prompt direction in carrying out the finite element analysis and experiments is greatly appreciated. His in-depth technical knowledge and enthusiasm for research helped me a lot. Prof. Upadrasta Ramamurty deserves special thanks for providing me an opportunity to join NTU Singapore and conduct experiments. I express my sincere gratitude to Prof. Lakshmi Narayan Ramasubramanian and Prof. Long Zhang for their valuable support in procuring the materials. Without the continuous support of Prof. Lakshmi Narayan Ramasubramanian, preparing the papers would ha...

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Cooperative Shear in Bulk Metallic Glass Composites Containing Metastable β -Ti Dendrites

Cited by 20 publications

References 37 publications

Improved tensile plasticity of bulk metallic glasses by heightening microstructural heterogeneity and energy state

Improved tensile plasticity of bulk metallic glasses by heightening microstructural heterogeneity and energy state

Role of Glass Composition on Mechanical Properties of Shape Memory Alloy‐Metallic Glass Composites

Studies on fracture of bulk metallic glasses and their composites

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