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Investigation of thermal tempering i...

Aydiner, Cahit Can.

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Investigation of thermal tempering in bulk metallic glasses.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigation of thermal tempering in bulk metallic glasses./
作者:	Aydiner, Cahit Can.
面頁冊數:	145 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 5223.
Contained By:	Dissertation Abstracts International65-10B.
標題:	Applied Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3151336
ISBN:	0496113224

Investigation of thermal tempering in bulk metallic glasses.
Aydiner, Cahit Can.

Investigation of thermal tempering in bulk metallic glasses. - 145 p.

Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 5223.

Thesis (Ph.D.)--California Institute of Technology, 2004.

Bulk metallic glasses are recent advanced materials which generate residual stresses due to rapid cooling from their surfaces during processing. These stresses arise from the thermal gradients that form within the sample at and above the glass transition region. A typical processing of BMGs involves feeding the alloy melt into a mold followed by severe quenching. The formation and nature of these stresses are analogous to the residual stresses due to the thermal tempering of silicate glasses. This analytical-experimental study investigates the thermal tempering phenomenon in BMGs for the first time.

ISBN: 0496113224Subjects--Topical Terms:

1018410
Applied Mechanics.

Investigation of thermal tempering in bulk metallic glasses.
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100 1 $a Aydiner, Cahit Can. $3 1929660
245 1 0 $a Investigation of thermal tempering in bulk metallic glasses.
300 $a 145 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 5223.
500 $a Adviser: Ersan Ustundag.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2004.
520 $a Bulk metallic glasses are recent advanced materials which generate residual stresses due to rapid cooling from their surfaces during processing. These stresses arise from the thermal gradients that form within the sample at and above the glass transition region. A typical processing of BMGs involves feeding the alloy melt into a mold followed by severe quenching. The formation and nature of these stresses are analogous to the residual stresses due to the thermal tempering of silicate glasses. This analytical-experimental study investigates the thermal tempering phenomenon in BMGs for the first time.
520 $a One of the best glass forming metallic alloys, Zr 41.2Ti13.8Cu12.5 Ni10Be22.5 (Vitreloy 1(TM)), is employed in this study. First, the best technique for the high-resolution measurement of residual stresses in BMGs is determined to be the crack compliance method. Second, the formation of the stresses is modeled with three different levels of viscoelastic phenomenology, namely, an instant freezing model, a viscoelastic model and a structural model. The constitutive laws for the viscoelastic and structural models are incorporated into the finite element method (ABAQUS(TM) software package) allowing the application of these models to complex geometries. To increase the accuracy of the analysis, the 'correct' temperature evolution in the sample during processing has to be input to these 'mechanical' models. Therefore, the heat transfer problem during the casting process of the BMG is analyzed in detail. Accuracy also requires a detailed knowledge of the thermal parameters of the material as a function of temperature; thus, some attention is also devoted to their measurement.
520 $a At the end, calculated and measured stresses are compared and good agreement is achieved. BMGs are demonstrated to be capable of generating very high (around 400 MPa) compression on their surfaces. The study also yielded valuable physical insight into the thermal tempering process itself. It is seen that this process exhibits significant discrepancies in BMGs compared to its analogy in silicate glasses. For instance, the transient tensile stresses that develop in the latter are shown to be lacking in the BMGs. Overall, this investigation developed sufficient understanding of the thermal tempering phenomenon in BMGs to establish it as a viable process to manipulate properties.
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710 2 0 $a California Institute of Technology. $3 726902
773 0 $t Dissertation Abstracts International $g 65-10B.
790 1 0 $a Ustundag, Ersan, $e advisor
790 $a 0037
791 $a Ph.D.
792 $a 2004
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