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The Development of Hard Materials an...

Brune, Paul Michael,

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The Development of Hard Materials and Fibrous Monolith Composites for Friction Stir Welding /

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Development of Hard Materials and Fibrous Monolith Composites for Friction Stir Welding // Paul Michael Brune.
Author:	Brune, Paul Michael,
Description:	1 electronic resource (167 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Materials science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31293300
ISBN:	9798383098424

The Development of Hard Materials and Fibrous Monolith Composites for Friction Stir Welding /
Brune, Paul Michael,

The Development of Hard Materials and Fibrous Monolith Composites for Friction Stir Welding /Paul Michael Brune. - 1 electronic resource (167 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

This research focuses on the development of hard materials and fibrous monolith composites for the purpose of adding to current friction stir welding tool technology. Well studied hard material systems, such as WC-Co, were incorporated and evaluated as cell materials for fibrous monolith composites with ductile cell boundaries of Co, W, and Mo. The indentation behavior of the WC-Co and WC-Co-cBN composites indicated possible crack deflection at the cell/cell boundary interface. Cylindrical pin friction stir welding tools were developed for each of the three fibrous monolith material systems. Welding was achieved on AA1100 aluminum, 260 brass, and AISI 1018 steel with WC-Co/Co fibrous monolith tools. It was determined that further refinement of process control and tool geometries could enable further success in welding higher hardness materials.The development of hard material systems was then focused on the synthesis and property measurement of novel high entropy carbide (HEC) ceramics. Five high purity and density HEC ceramics consisting of group 4-6 transition metals were synthesized and the hardness, thermal, and electrical properties were measured. The maximum Vickers hardness of the HECs was 43.5 ± 0.4 GPa for (Hf0.2,Mo0.2,Ti0.2,W0.2,Zr0.2)C at a load of 0.05 kgf. The room temperature thermal conductivity ranged from 5.1 W/mK for (Hf0.2Mo0.2Ti0.2W0.2Zr0.2)C to 9.0 W/mK for (Cr0.2Hf0.2Ta0.2Ti0.2Zr0.2)C. The electron contribution to thermal conductivity calculated from measured electrical resistivity varied from 41% to 52% of the total thermal conductivity.

English

ISBN: 9798383098424Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

Carbides

The Development of Hard Materials and Fibrous Monolith Composites for Friction Stir Welding /
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245 1 0 $a The Development of Hard Materials and Fibrous Monolith Composites for Friction Stir Welding / $c Paul Michael Brune.
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500 $a Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
500 $a Advisors: Watts, Jeremy Committee members: Hilmas, Gregory; Fahrenholtz, William; O'Malley, Ronald; Liou, Frank.
502 $b Ph.D. $c Missouri University of Science and Technology $d 2024.
520 $a This research focuses on the development of hard materials and fibrous monolith composites for the purpose of adding to current friction stir welding tool technology. Well studied hard material systems, such as WC-Co, were incorporated and evaluated as cell materials for fibrous monolith composites with ductile cell boundaries of Co, W, and Mo. The indentation behavior of the WC-Co and WC-Co-cBN composites indicated possible crack deflection at the cell/cell boundary interface. Cylindrical pin friction stir welding tools were developed for each of the three fibrous monolith material systems. Welding was achieved on AA1100 aluminum, 260 brass, and AISI 1018 steel with WC-Co/Co fibrous monolith tools. It was determined that further refinement of process control and tool geometries could enable further success in welding higher hardness materials.The development of hard material systems was then focused on the synthesis and property measurement of novel high entropy carbide (HEC) ceramics. Five high purity and density HEC ceramics consisting of group 4-6 transition metals were synthesized and the hardness, thermal, and electrical properties were measured. The maximum Vickers hardness of the HECs was 43.5 ± 0.4 GPa for (Hf0.2,Mo0.2,Ti0.2,W0.2,Zr0.2)C at a load of 0.05 kgf. The room temperature thermal conductivity ranged from 5.1 W/mK for (Hf0.2Mo0.2Ti0.2W0.2Zr0.2)C to 9.0 W/mK for (Cr0.2Hf0.2Ta0.2Ti0.2Zr0.2)C. The electron contribution to thermal conductivity calculated from measured electrical resistivity varied from 41% to 52% of the total thermal conductivity.
546 $a English
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650 4 $a Materials science. $3 543314
650 4 $a Applied physics. $3 3343996
650 4 $a Thermodynamics. $3 517304
653 $a Carbides
653 $a Fibrous monolith
653 $a Friction stir welding
653 $a High entropy carbides
653 $a Thermal conductivity
653 $a Vickers hardness
690 $a 0794
690 $a 0215
690 $a 0348
710 2 $a Missouri University of Science and Technology. $b Ceramic Engineering. $e degree granting institution. $3 3823470
720 1 $a Watts, Jeremy $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-12B.
790 $a 0587
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31293300