Assessing the fracture toughness in Tungsten-based nanocomposites: A micro-mechanical approach.
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| Title: | Assessing the fracture toughness in Tungsten-based nanocomposites: A micro-mechanical approach. |
|---|---|
| Authors: | Schmuck, K.1 (AUTHOR), Burtscher, M.1 (AUTHOR), Alfreider, M.1 (AUTHOR), Kiener, D.1 (AUTHOR) daniel.kiener@unileoben.ac.at |
| Source: | Materials & Design. Nov2024, Vol. 247, pN.PAG-N.PAG. 1p. |
| Subjects: | Young's modulus, Fracture toughness, Mechanical alloying, Zinc alloys, Copper |
| Abstract: | [Display omitted] • Grain-size tailoring of WCu and W-α-brass in the nc-regime by high-pressure torsion. • Young's modulus variation due to significant change of grain-boundary volume. • Assessing fracture characteristics by in-situ micro cantilever bending beams. • Improve of mechanical properties by alloying the copper phase with 10 wt.% zinc. Nanocrystalline tungsten-copper composites can favorably combine the outstanding material properties of both elements. This work investigates tungsten-copper composites fabricated from elemental powders with 80 wt.% tungsten and either copper or α -brass containing 20 wt.% zinc, respectively. Moreover, high-pressure torsion is used to compact the powders, strengthen the resulting composite by grain refinement, and tailor the grain-size in the nanocrystalline regime by varying the deformation temperature between RT, 400°C and 550°C, resulting in grain-sizes of 9 nm 14 nm and 28 nm, respectively. Hardness measurements revealed a transition from normal to inverse Hall-Petch behavior for grain-sizes below 11 nm. To examine the fracture properties, micro-cantilever bending beams with a cross-section of 10x10 µm2 were fabricated. Evaluation of these experiments indicated a fracture toughness of 3 MPa m . The slight decrease of fracture toughness between a grain-size of 9 nm to 14 nm indicates a reduction of the grain boundary cohesion strength. The grain-size increase to 28 nm reversed the trend in fracture toughness and raised it to 3.4 MPa m , which points to activating additional deformation mechanisms, such as dislocation-accumulation and twinning. Additionally, alloying with zinc raised the composites strength and retained the composites fracture toughness, benefiting the damage tolerance. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 181282558 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Assessing the fracture toughness in Tungsten-based nanocomposites: A micro-mechanical approach. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Schmuck%2C+K%2E%22">Schmuck, K.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burtscher%2C+M%2E%22">Burtscher, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alfreider%2C+M%2E%22">Alfreider, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kiener%2C+D%2E%22">Kiener, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> daniel.kiener@unileoben.ac.at</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Materials+%26+Design%22">Materials & Design</searchLink>. Nov2024, Vol. 247, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Young's+modulus%22">Young's modulus</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+toughness%22">Fracture toughness</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+alloying%22">Mechanical alloying</searchLink><br /><searchLink fieldCode="DE" term="%22Zinc+alloys%22">Zinc alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Copper%22">Copper</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: [Display omitted] • Grain-size tailoring of WCu and W-α-brass in the nc-regime by high-pressure torsion. • Young's modulus variation due to significant change of grain-boundary volume. • Assessing fracture characteristics by in-situ micro cantilever bending beams. • Improve of mechanical properties by alloying the copper phase with 10 wt.% zinc. Nanocrystalline tungsten-copper composites can favorably combine the outstanding material properties of both elements. This work investigates tungsten-copper composites fabricated from elemental powders with 80 wt.% tungsten and either copper or α -brass containing 20 wt.% zinc, respectively. Moreover, high-pressure torsion is used to compact the powders, strengthen the resulting composite by grain refinement, and tailor the grain-size in the nanocrystalline regime by varying the deformation temperature between RT, 400°C and 550°C, resulting in grain-sizes of 9 nm 14 nm and 28 nm, respectively. Hardness measurements revealed a transition from normal to inverse Hall-Petch behavior for grain-sizes below 11 nm. To examine the fracture properties, micro-cantilever bending beams with a cross-section of 10x10 µm2 were fabricated. Evaluation of these experiments indicated a fracture toughness of 3 MPa m . The slight decrease of fracture toughness between a grain-size of 9 nm to 14 nm indicates a reduction of the grain boundary cohesion strength. The grain-size increase to 28 nm reversed the trend in fracture toughness and raised it to 3.4 MPa m , which points to activating additional deformation mechanisms, such as dislocation-accumulation and twinning. Additionally, alloying with zinc raised the composites strength and retained the composites fracture toughness, benefiting the damage tolerance. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.matdes.2024.113433 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Young's modulus Type: general – SubjectFull: Fracture toughness Type: general – SubjectFull: Mechanical alloying Type: general – SubjectFull: Zinc alloys Type: general – SubjectFull: Copper Type: general Titles: – TitleFull: Assessing the fracture toughness in Tungsten-based nanocomposites: A micro-mechanical approach. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Schmuck, K. – PersonEntity: Name: NameFull: Burtscher, M. – PersonEntity: Name: NameFull: Alfreider, M. – PersonEntity: Name: NameFull: Kiener, D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 02641275 Numbering: – Type: volume Value: 247 Titles: – TitleFull: Materials & Design Type: main |
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