서브메뉴
검색
In Situ Studies of Pattern Formation and Evolution in Complex, Multi-Phase Alloys
In Situ Studies of Pattern Formation and Evolution in Complex, Multi-Phase Alloys
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152104
- ISBN
- 9798382740256
- DDC
- 620.11
- 서명/저자
- In Situ Studies of Pattern Formation and Evolution in Complex, Multi-Phase Alloys
- 발행사항
- [Sl] : University of Michigan, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 301 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Shahani, Ashwin J.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2024.
- 초록/해제
- 요약This dissertation delves into the growth and coarsening of three-phase eutectics and off-peritectics, employing Al-Ag2Al-Al2Cu and Zn-AgZn3 alloys as representative systems. The investigation seeks a comprehensive understanding of pattern formation, exploring the interplay among local composition, crystalline anisotropy, and growth velocity. Through state-of-the-art experimental methods, the study conducts a thorough microstructural analysis during solidification and coarsening, leveraging recent advancements in X-ray transmission microscopy and machine learning tools.The research provides new insights into the four-dimensional (i.e., three-dimensional space- and time-resolved) morphological and crystallographic evolution of these materials. The outcomes lay the foundation for theoretical development and refinement, offering, e.g., real-time perspectives on the formation of a three-phase eutectic microstructure along the surface of a primary phase; a 4D view of the morphological and crystallographic evolution of three-phase eutectic; and in situ observations of the directional solidification of a metallic off-peritectic alloy.Broadly, these studies bring to light the importance of growth competition in shaping multi-phase patterns. For example, we observed pseudo-2D dendritic 'finger' formations on primary Al2Cu rods due to local microsegregation of Al and Ag, in turn influencing pattern formation in the Al-Ag-Cu eutectic. Similar effects were found in Zn-AgZn3 alloys, leading to a distinct partially banded morphology. Crystallographic anisotropy also played a significant role in pattern formation and evolution, with primary Al2Cu rods dominating the surrounding morphology and crystallography of the Al-Ag-Cu eutectic. Likewise, the interplay of multiple phases and their associated phase-interfaces led to a remarkable complexity in the patterns that formed. Take for instance the Al-Al2Cu and Ag2Al-Al2Cu interphase boundaries, which influenced eutectic morphology and suppressed the coarsening rate of Ag2Al. Additionally, our work highlights the impact of alloy composition and growth conditions on pattern stability, demonstrated by a composition-velocity eutectic stability field for the AlAg-Cu ternary system. In directionally solidified Zn-AgZn3, the solidification time emerged as a critical parameter influencing pattern selection, particularly with reference to solid-state coarsening of primary AgZn3 columns, which eliminated trapped liquid channels within which the peritectic could nucleate and grow.By focusing on the model alloy systems of Al-Ag2Al-Al2Cu and Zn-AgZn3, this dissertation aims to advance our understanding of pattern formation and evolution in three-phase eutectics and off-peritectic materials. The insights gained may hold potential implications for the manufacture of natural composite materials with various commercial and industrial applications.
- 일반주제명
- Materials science
- 일반주제명
- Applied physics
- 일반주제명
- Engineering
- 키워드
- Solidification
- 키워드
- Eutectic
- 키워드
- Peritectic
- 키워드
- Coarsening
- 키워드
- X-ray tomography
- 기타저자
- University of Michigan Materials Science and Engineering
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017162854
■00520250211152104
■006m o d
■007cr#unu||||||||
■020 ▼a9798382740256
■035 ▼a(MiAaPQ)AAI31349054
■035 ▼a(MiAaPQ)umichrackham005460
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aLindemann, George R.
■24510▼aIn Situ Studies of Pattern Formation and Evolution in Complex, Multi-Phase Alloys
■260 ▼a[Sl]▼bUniversity of Michigan▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a301 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Shahani, Ashwin J.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2024.
■520 ▼aThis dissertation delves into the growth and coarsening of three-phase eutectics and off-peritectics, employing Al-Ag2Al-Al2Cu and Zn-AgZn3 alloys as representative systems. The investigation seeks a comprehensive understanding of pattern formation, exploring the interplay among local composition, crystalline anisotropy, and growth velocity. Through state-of-the-art experimental methods, the study conducts a thorough microstructural analysis during solidification and coarsening, leveraging recent advancements in X-ray transmission microscopy and machine learning tools.The research provides new insights into the four-dimensional (i.e., three-dimensional space- and time-resolved) morphological and crystallographic evolution of these materials. The outcomes lay the foundation for theoretical development and refinement, offering, e.g., real-time perspectives on the formation of a three-phase eutectic microstructure along the surface of a primary phase; a 4D view of the morphological and crystallographic evolution of three-phase eutectic; and in situ observations of the directional solidification of a metallic off-peritectic alloy.Broadly, these studies bring to light the importance of growth competition in shaping multi-phase patterns. For example, we observed pseudo-2D dendritic 'finger' formations on primary Al2Cu rods due to local microsegregation of Al and Ag, in turn influencing pattern formation in the Al-Ag-Cu eutectic. Similar effects were found in Zn-AgZn3 alloys, leading to a distinct partially banded morphology. Crystallographic anisotropy also played a significant role in pattern formation and evolution, with primary Al2Cu rods dominating the surrounding morphology and crystallography of the Al-Ag-Cu eutectic. Likewise, the interplay of multiple phases and their associated phase-interfaces led to a remarkable complexity in the patterns that formed. Take for instance the Al-Al2Cu and Ag2Al-Al2Cu interphase boundaries, which influenced eutectic morphology and suppressed the coarsening rate of Ag2Al. Additionally, our work highlights the impact of alloy composition and growth conditions on pattern stability, demonstrated by a composition-velocity eutectic stability field for the AlAg-Cu ternary system. In directionally solidified Zn-AgZn3, the solidification time emerged as a critical parameter influencing pattern selection, particularly with reference to solid-state coarsening of primary AgZn3 columns, which eliminated trapped liquid channels within which the peritectic could nucleate and grow.By focusing on the model alloy systems of Al-Ag2Al-Al2Cu and Zn-AgZn3, this dissertation aims to advance our understanding of pattern formation and evolution in three-phase eutectics and off-peritectic materials. The insights gained may hold potential implications for the manufacture of natural composite materials with various commercial and industrial applications.
■590 ▼aSchool code: 0127.
■650 4▼aMaterials science
■650 4▼aApplied physics
■650 4▼aEngineering
■653 ▼aSolidification
■653 ▼aEutectic
■653 ▼aPeritectic
■653 ▼aCoarsening
■653 ▼aX-ray tomography
■690 ▼a0794
■690 ▼a0537
■690 ▼a0215
■71020▼aUniversity of Michigan▼bMaterials Science and Engineering.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162854▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
