The effect of simulated thermal cycling on thermal and mechanical stability of a Ti-based bulk metallic glass

Wang, X.; Shao, Yang; Gong, Pan; Yao, Kefu

doi:10.1016/j.jallcom.2013.05.194

Cited by 35 publications

(11 citation statements)

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“…A Ti-based BMG cycled up to 400 times between 77 K and 423 K (to simulate conditions on the surface of a spacecraft in low earth orbit) showed slight relaxation rather than rejuvenation 31 . This suggests that there is a significant annealing effect during the holds (25 min each) at the upper temperature, which itself is higher than in our work (and corresponds to T/T g 5 0.68, inside the range associated with b relaxation, see Fig.…”

Section: Methodsmentioning

confidence: 99%

Rejuvenation of metallic glasses by non-affine thermal strain

Ketov

Sun

Nachum

et al. 2015

Nature

624

300

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When a spatially uniform temperature change is imposed on a solid with more than one phase, or on a polycrystal of a single, non-cubic phase (showing anisotropic expansion-contraction), the resulting thermal strain is inhomogeneous (non-affine). Thermal cycling induces internal stresses, leading to structural and property changes that are usually deleterious. Glasses are the solids that form on cooling a liquid if crystallization is avoided--they might be considered the ultimate, uniform solids, without the microstructural features and defects associated with polycrystals. Here we explore the effects of cryogenic thermal cycling on glasses, specifically metallic glasses. We show that, contrary to the null effect expected from uniformity, thermal cycling induces rejuvenation, reaching less relaxed states of higher energy. We interpret these findings in the context that the dynamics in liquids become heterogeneous on cooling towards the glass transition, and that there may be consequent heterogeneities in the resulting glasses. For example, the vibrational dynamics of glassy silica at long wavelengths are those of an elastic continuum, but at wavelengths less than approximately three nanometres the vibrational dynamics are similar to those of a polycrystal with anisotropic grains. Thermal cycling of metallic glasses is easily applied, and gives improvements in compressive plasticity. The fact that such effects can be achieved is attributed to intrinsic non-uniformity of the glass structure, giving a non-uniform coefficient of thermal expansion. While metallic glasses may be particularly suitable for thermal cycling, the non-affine nature of strains in glasses in general deserves further study, whether they are induced by applied stresses or by temperature change.

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Section: Methodsmentioning

confidence: 99%

Rejuvenation of metallic glasses by non-affine thermal strain

Ketov

Sun

Nachum

et al. 2015

Nature

624

300

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show abstract

“…Moreover, although BMGs are metastable in thermodynamics, Ti-based BMGs exhibit high space environment applicability. According to Wang et al's experimental results [239], the microstructure, thermodynamics, and mechanical properties of Ti-based BMGs are all relatively stable after simulated thermal cycling treatment in vacuum in a temperature range of −196 • C to 150 • C. The effect of atomic oxygen (AO) on the BMGs has been also studied in a plasma type ground-based AO effect simulation facility. The results show that the structure on the surfaces of Ti-based BMGs samples do not change much, suggesting that Ti-based BMGs have high AO erosion resistance [240].…”

Section: Conclusion and Future Research Directionsmentioning

confidence: 99%

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Gong

Deng

Jin

et al. 2016

Metals

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Abstract:Ti-based bulk metallic glasses (BMGs) are very attractive for applications because of their excellent properties such as high specific strength and high corrosion resistance. In this paper, we briefly review the current status of the research and development of Ti-based bulk metallic glasses. Emphasis is laid on glass-forming ability, mechanical properties, corrosion resistance, and biocompatibility.

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“…Greer et al (2013) proposed that the mechanical behavior of metallic glasses strongly depends on their thermal and mechanical history. Therefore, typical thermal treatments such as sub-T g annealing (Ramamurty et al, 2002), over-T g annealing , thermal cycling (Wang et al, 2012(Wang et al, , 2013 and electropulsing treatment (Zhang and Yao, 2005) all obviously affect the structural relaxation behaviors and mechanical properties of BMGs. For similar reasons, typical casting parameters such as cast temperature (Mao et al, 2009(Mao et al, , 2010 and cooling rate (Shen et al, 2007;Hu et al, 2012) also show great influence on structure and property of BMGs.…”

Section: Discussionmentioning

confidence: 99%