High-Throughput Nanomechanical Screening of Phase-Specific and Temperature-Dependent Hardness in AlxFeCrNiMn High-Entropy Alloys

Chen, Youxing; Hintsala, Eric; Li, Nan; Becker, Bernard R.; Cheng, Justin; Nowakowski, Bartosz; Weaver, Jordan S.; Stauffer, Douglas; Mara, Nathan A.

doi:10.1007/s11837-019-03714-2

“…Another technique is to use multivariate K-means cluster analysis [26], which incorporates several properties and performs an error minimization to split the data into several clusters which can be individually evaluated. This has been demonstrated on large nanoindentation datasets on thermal barrier coatings [21] and high entropy alloys [24].…”

Section: Discussionmentioning

confidence: 87%

“…This has been applied on a range of materials from cemented carbides [13,18,19], steels [20], and thermal barrier coatings [21] to actual cements [22,23]. By combining this technique with elevated temperature capable systems, the activation parameters of individual phases can also be extracted [24], or using a combinatorial approach on a diffusion couple, entire slices of phase diagrams can be interrogated at once [25]. High-speed nanoindentation mapping is still being actively developed, but it promises to become a ubiquitous tool for mechanical microscopy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical phase mapping of the Taza meteorite using correlated high-speed nanoindentation and EDX

Wheeler

¹

2020

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“…Another technique is to use multivariate K-means cluster analysis [26], which incorporates several properties and performs an error minimization to split the data into several clusters which can be individually evaluated. This has been demonstrated on large nanoindentation datasets on thermal barrier coatings [21] and high entropy alloys [24].…”

Section: Discussionmentioning

confidence: 89%

“…This has been applied on a range of materials from cemented carbides [13,18,19], steels [20], and thermal barrier coatings [21] to actual cements [22,23]. By combining this technique with elevated temperature capable systems, the activation parameters of individual phases can also be extracted [24], or using a combinatorial approach on a diffusion couple, entire slices of phase diagrams can be interrogated at once [25]. High-speed nanoindentation mapping is still being actively developed, but it promises to become a ubiquitous tool for mechanical microscopy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical phase mapping of the Taza meteorite using correlated high‐speed nanoindentation and EDX

Wheeler

¹

2021

Journal of Materials Research

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Meteorites have one of the most unique and beautiful microstructures, the Widmanstätten structure. This consists of large, elongated bands which form an intricate octahedral lace of crystalline metal. This structure makes meteorites an ideal case to demonstrate the capabilities of mechanical phase mapping using high-speed nanoindentation. In this work, the mechanical properties and composition of the Taza meteorite were mapped using ∼100,000 indentations to statistically determine the properties of the individual phases. Five microstructural phases were characterized in this meteorite: Kamacite, Plessite, Tetrataenite, Cloudy Zone, and Schreibersite. Mechanical phase identification was confirmed using EDX measurements, and the first direct, pointto-point correlation of EDX and large-scale indentation maps was achieved. Mechanical phase maps showed superior phase contrast to EDX in two phases. An indentation property map or a mechanical phase map using a 2D histogram was used to visualize and statistically characterize the phases and identify trends in their relationships.

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“…It can be used also to evaluate small-scale mechanical properties by controlling a small load; that is, the mechanical properties of a heterogeneous microstructure can be evaluated [1][2][3]. Using this technology, highthroughput evaluation of microscopic mechanical properties has been conducted to characterize the microscopic heterogeneity [4,5] and obtain massive material data [6].…”

Section: Introductionmentioning

confidence: 99%

Data-driven estimation of plastic properties of alloys using neighboring indentation test

Chen

¹

,

Watanabe

²

,

Liu

³

et al. 2021

Science and Technology of Advanced Materials: Methods

2

0

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A data-driven estimation method for the plastic properties of alloys was proposed using indentations at neighboring positions. An instrumented indentation test is an efficient approach to measure mechanical properties such as equivalent elastic modulus and hardness. In the mechanical test, subsequent experiments are generally performed apart from existing indentations to avoid the interaction effect caused by the dependency on the deformation history of metal plasticity. In this study, the interaction effect was utilized to estimate the plastic properties, based on the difference of load-depth curves between the first and second indentations at neighboring positions. Using finite element simulations of the neighboring indentation tests, the effective experimental conditions were examined, and response surfaces of the loading curvatures were characterized to determine two material constants of a simple constitutive model of plasticity. Finally, the proposed approach was validated for application to aluminum alloys and stainless steel. It can be also applied to various alloys characterized by different elastic moduli. KEYWORDS elastic-plastic material; finite element method; mechanical testing; response surface; instrumented indentation test; material database; ARTICLE CLASSIFICATION: Data analysis (AI, machine learning, data-driven analysis, descriptor development, structure search/identification)

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High-Throughput Nanomechanical Screening of Phase-Specific and Temperature-Dependent Hardness in AlxFeCrNiMn High-Entropy Alloys

Cited by 19 publications

References 29 publications

Mechanical phase mapping of the Taza meteorite using correlated high-speed nanoindentation and EDX

Mechanical phase mapping of the Taza meteorite using correlated high-speed nanoindentation and EDX

Mechanical phase mapping of the Taza meteorite using correlated high‐speed nanoindentation and EDX

Data-driven estimation of plastic properties of alloys using neighboring indentation test

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