Tuning the microstructure and metastability of β-Ti for simultaneous enhancement of strength and ductility of Ti-based bulk metallic glass composites

Zhang, Lili T.; Narayan, Ranjani; Fu, Huameng; Ramamurty, U.; Li, Weirong; Li, Yangde; Zhang, Haifeng

doi:10.1016/j.actamat.2019.02.002

Cited by 97 publications

(41 citation statements)

References 53 publications

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“…The ZT-M strip clearly exhibits a composite microstructure (Figure 6a) with β-Ti crystals embedded in the glassy matrix. The average diameter of β-Ti crystals is only ~250 nm, one magnitude smaller than the crystal size in the ZT-M rods produced by copper mold casting [7,8]. This also implies the high cooling rate of the triple twin-roller casting.…”

Section: Resultsmentioning

confidence: 99%

“…Metallic glasses (MGs) and metallic glass composites (MGCs) containing in-situ formed crystalline phases are potential structural materials due to their excellent mechanical properties, including high strength, high hardness and high elastic limit [1,2,3,4,5]. The in-situ formed crystals in MGCs are elaborately introduced for improving the plasticity of MGs [6,7,8,9,10,11]. MG and MGC strips, as initial materials, are widely used for making products via the thermoplastic forming process in the super-cooled liquid region [12,13].…”

Section: Introductionmentioning

confidence: 99%

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A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

Zhang

Chen

et al. 2019

Materials

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To date it has not been possible to produce metallic glass strips with a thickness larger than 150 μm via single-roller melt spinning technique, and it remains challenging to produce thick metallic glass strips. In this work, a multiple twin-roller casting technique is proposed for producing thick metallic glass and metallic glass composite strips. A triple twin-roller casting device, as a specific case of the multiple twin-roller, was designed and manufactured. The triple twin-roller device possesses a high cooling rate and involves a long contact time between the melt and the strip, which makes it an efficient technique for producing metallic glass strips that avoids crystallization, although the solidification temperature ranges of metallic glasses are as wide as several hundred Kelvins. The two prepared metallic glass (MG) strips are in a fully amorphous state, and the MG strip shows excellent capacity of stored elastic energy under 3-point bending. Furthermore, the Ti-based metallic glass composite strip produced via the triple twin-roller casting exhibits a novel microstructure with much finer and more homogenously orientated β-Ti crystals, as compared with the microstructure of metallic glass composites produced by the common copper mold casting technique.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

Zhang

Chen

et al. 2019

Materials

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“…Moreover, a high volume fraction of soft precipitates improves the ductility of the MG composites but may significantly lower their strength [14,15]. Besides, MG composites reinforced with a B2-type shape memory phase show extraordinary plasticity together with work hardening capability [7,16,17,18,19,20,21,22]. Here, the deformation-induced martensitic phase transformation of B2 to B19′ provides a high density of interfaces of phases and twins [8].…”

Section: Introductionmentioning

confidence: 99%

Structure–Property Relationships in Shape Memory Metallic Glass Composites

et al. 2019

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Metallic glass composites with shape memory crystals show enhanced plasticity and work-hardening capability. We investigate the influence of various critical structural aspects such as, the density of crystalline precipitates, their distribution and size, and the structural features and intrinsic properties of the phase on the deformation behavior of metallic amorphous Cu 64 Zr 36 composites with B2 CuZr inclusions using molecular dynamics simulations. We find that a low density of small B2 inclusions with spacing smaller than the critical shear band length controls the formation and distribution of plastic zones in the composite and hinders the formation of critical shear bands. When the free path for shearing allows the formation of mature shear bands a high volume fraction of large B2 precipitates is necessary to stabilize the shear flow and avoid runaway instability. Additionally, we also investigate the deformation mechanism of composites with pure copper crystals for comparison, in order to understand the superior mechanical properties of metallic glass composites with shape memory crystals in more detail. The complex and competing mechanisms of deformation occurring in shape memory metallic glass composites allow this class of materials to sustain large tensile deformation, even though only a low-volume fraction of crystalline inclusions is present.

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“…晶体相的引入, 一方面能够阻碍剪切带的扩展, 抑制沿剪切带的快速断裂 [8] ; 同时晶体相与非晶基体之间因强度差异造成的应力集中能够促进非晶基体形成多重剪切带 [12,13] , 提高非晶材料塑性变形能力. 实验研究表明, 通过优化非晶复合材料的微观组织结构, 如体积分数 [14,15] 、形状 [16] 、晶粒尺寸 [17,18] 、界面强度 [19] 等, 可实现非晶合金复合材料力学性能的改善.…”

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Deformation field evolution and shear banding of an <italic>in-situ</italic> crystal reinforced amorphous alloy composite

Dai

Chen

Liu

2020

Sci. Sin.-Phys. Mech. Astron.

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Tuning the microstructure and metastability of β-Ti for simultaneous enhancement of strength and ductility of Ti-based bulk metallic glass composites

Cited by 97 publications

References 53 publications

A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

Structure–Property Relationships in Shape Memory Metallic Glass Composites

Deformation field evolution and shear banding of an <italic>in-situ</italic> crystal reinforced amorphous alloy composite

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Tuning the microstructure and metastability of β-Ti for simultaneous enhancement of strength and ductility of Ti-based bulk metallic glass composites

Cited by 97 publications

References 53 publications

A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips

Structure–Property Relationships in Shape Memory Metallic Glass Composites

Deformation field evolution and shear banding of an &lt;italic&gt;in-situ&lt;/italic&gt; crystal reinforced amorphous alloy composite

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Deformation field evolution and shear banding of an <italic>in-situ</italic> crystal reinforced amorphous alloy composite