東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Stretching the Limits in Thermoplastic Forming of Bulk Metallic Glasses.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Stretching the Limits in Thermoplastic Forming of Bulk Metallic Glasses./
作者:	Ojeda Mota, Rodrigo Miguel.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	134 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
Contained By:	Dissertations Abstracts International83-02B.
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28322162
ISBN:	9798522999636

Stretching the Limits in Thermoplastic Forming of Bulk Metallic Glasses.
Ojeda Mota, Rodrigo Miguel.

Stretching the Limits in Thermoplastic Forming of Bulk Metallic Glasses. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 134 p.

Source: Dissertations Abstracts International, Volume: 83-02, Section: B.

Thesis (Ph.D.)--Yale University, 2021.

This item must not be sold to any third party vendors.

Metallic glasses (MG) suggest that superb mechanical properties can be paired with plastic-like processing. Their high strength and elasticity are often paired with fracture toughness. Their supercooled liquid region gives rise to plastic-like processing and suggests parts and shapes that can otherwise not be obtained for crystalline metals. However, current processing techniques only allow for limited options in terms of geometry, thicknesses uniformity, and shape complexity. In the first part of my thesis, I introduce the form-giving aspect of metallic glass thermoforming, by introducing stretch blow molding, to expand the geometries that can be fabricated with metallic glasses. For this I developed a model, which allows to quantify stretch blow molding and provides insight into its potential use and limitations. We demonstrate that with stretch blow molding overall strains exceeding 2000% are achievable, significantly higher than the previously reported ~150% of blow molding. In the second part of my thesis, I focused on the effect of the processing on metallic glasses properties. This is motivated by the current understanding that most metallic glasses lack sufficient ductility or toughness when fabricated under conditions resulting in bulk glass formation. To address this shortcoming, I used strain rate to excite the liquid while simultaneously cooling it to freeze the excited liquid into a glass with a higher fictive temperature. Microscopically, straining causes the structure to dilate, hence "pulls" the structure energetically up the potential energy landscape. Upon further cooling, the resulting excited liquid freezes into an excited glass that exhibits enhanced ductility. I used Zr44Ti11Cu10Ni10Be25 as an example to pull metallic glasses through this excited liquid cooling method, which can lead to the tripling of bending ductility.

ISBN: 9798522999636Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Bulk metallic glasses

Stretching the Limits in Thermoplastic Forming of Bulk Metallic Glasses.
LDR:03041nmm a2200385 4500 001 2344777
005 20220531062136.5
008 241004s2021 ||||||||||||||||| ||eng d
020 $a 9798522999636
035 $a (MiAaPQ)AAI28322162
035 $a AAI28322162
040 $a MiAaPQ $c MiAaPQ
100 1 $a Ojeda Mota, Rodrigo Miguel. $3 3683585
245 1 0 $a Stretching the Limits in Thermoplastic Forming of Bulk Metallic Glasses.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 134 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
500 $a Advisor: Schroers, Jan.
502 $a Thesis (Ph.D.)--Yale University, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Metallic glasses (MG) suggest that superb mechanical properties can be paired with plastic-like processing. Their high strength and elasticity are often paired with fracture toughness. Their supercooled liquid region gives rise to plastic-like processing and suggests parts and shapes that can otherwise not be obtained for crystalline metals. However, current processing techniques only allow for limited options in terms of geometry, thicknesses uniformity, and shape complexity. In the first part of my thesis, I introduce the form-giving aspect of metallic glass thermoforming, by introducing stretch blow molding, to expand the geometries that can be fabricated with metallic glasses. For this I developed a model, which allows to quantify stretch blow molding and provides insight into its potential use and limitations. We demonstrate that with stretch blow molding overall strains exceeding 2000% are achievable, significantly higher than the previously reported ~150% of blow molding. In the second part of my thesis, I focused on the effect of the processing on metallic glasses properties. This is motivated by the current understanding that most metallic glasses lack sufficient ductility or toughness when fabricated under conditions resulting in bulk glass formation. To address this shortcoming, I used strain rate to excite the liquid while simultaneously cooling it to freeze the excited liquid into a glass with a higher fictive temperature. Microscopically, straining causes the structure to dilate, hence "pulls" the structure energetically up the potential energy landscape. Upon further cooling, the resulting excited liquid freezes into an excited glass that exhibits enhanced ductility. I used Zr44Ti11Cu10Ni10Be25 as an example to pull metallic glasses through this excited liquid cooling method, which can lead to the tripling of bending ductility.
590 $a School code: 0265.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Materials science. $3 543314
650 4 $a Metals. $3 601053
650 4 $a Research. $3 531893
650 4 $a Mechanical properties. $3 3549505
650 4 $a Raw materials. $3 648907
650 4 $a Manufacturing. $3 3389707
650 4 $a Viscosity. $3 1050706
650 4 $a Plastics. $3 649803
650 4 $a Wire. $3 3681397
650 4 $a Temperature. $3 711968
650 4 $a Equilibrium. $3 668417
650 4 $a Ductility. $3 3681454
650 4 $a Symmetry. $3 536815
650 4 $a Yield stress. $3 3561163
650 4 $a Heat. $3 573595
650 4 $a Ratios. $3 3561161
650 4 $a Polymer melts. $3 3683586
650 4 $a Deformation. $2 lcstt $3 3267001
650 4 $a Alloys. $3 654175
650 4 $a Geometry. $3 517251
650 4 $a Asymmetry. $3 3562922
653 $a Bulk metallic glasses
653 $a Ductility
653 $a Metallic glass
653 $a Processing
653 $a Strain
653 $a Stretch blow molding
690 $a 0794
690 $a 0548
690 $a 0795
710 2 $a Yale University. $b Mechanical Engineering and Materials Science. $3 2106379
773 0 $t Dissertations Abstracts International $g 83-02B.
790 $a 0265
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28322162