Effect of temperature on small-scale deformation of individual face-centered-cubic and body-centered-cubic phases of an Al0.7CoCrFeNi high-entropy alloy

Giwa, Adenike M.; Aitken, Zachary H.; Liaw, Peter K.; Zhang, Yong‐Wei; Greer, Julia R.

doi:10.1016/j.matdes.2020.108611

Cited by 23 publications

(2 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Uniaxial compression experiments on 49 bundles were performed in situ, in a Quanta SEM (ThermoFisher Scientific) equipped with an InSEM nanomechanical module (Nanomechanics, Inc.) using a 5 μm stainless steel flat punch tip. 19 Samples were loaded to ultimate failure under displacement control at a quasi-static strain rate of 10 −3 s −1 . Ultimate failure was determined as the point of structural collapse with no ability to bear an applied load.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Failure Mechanisms in Vertically Aligned Dense Nanowire Arrays

Gallivan

Greer

2021

Nano Lett.

Self Cite

View full text Add to dashboard Cite

Nanowires are an increasingly prevalent class of nanomaterials in composites and devices, with arrays and other complex geometries used in various applications. Little investigation has been done regarding the mechanical behavior of micron-sized nanowire structures. We conduct in situ microcompression experiments on vertically aligned dense microbundles of 300 nm diameter single-crystalline zinc oxide nanowires to gain insights into their structural failure. Experiments demonstrate that bundles containing approximately 10–130 nanowires experience two failure regimes: (1) localized noncatastrophic interfacial splitting and (2) global structural failure. Utilizing Weibull statistics and experimental results, we develop a technique for analyzing flaw distribution and use it to predict the expected range of bundle failure stress. This analysis provides guidelines for nanowire arrays’ susceptibility to failure, sensitivity to flaw size, interfacial interactions of constituents, and degree of alignment. This work develops insights to understand and predict fundamental failure mechanisms in highly aligned, dense structures.

show abstract

Section: ■ Materials and Methodsmentioning

confidence: 99%

Failure Mechanisms in Vertically Aligned Dense Nanowire Arrays

Gallivan

Greer

2021

Nano Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The compositions ~10 to 14 at.% Al lies in the hypoeutectic regime and ~14 to ~18 at.% Al lies in the hypereutectic regime. In the hypereutectic compositions, Al0.7CoCrFeNi (~15 at.% Al) was probably the most studied alloy system [12][13][14][15][16][17][18][19][20]. The microstructure in the as cast condition of this alloy consists of alternating FCC and BCC based lamellae.…”

mentioning

confidence: 99%