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Micro-pillar compression of nanocrys...

Schuster, Brian Elias.

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Micro-pillar compression of nanocrystalline and amorphous metals.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Micro-pillar compression of nanocrystalline and amorphous metals./
作者:	Schuster, Brian Elias.
面頁冊數:	168 p.
附註:	Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3220.
Contained By:	Dissertation Abstracts International69-05B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3313393
ISBN:	9780549620501

Micro-pillar compression of nanocrystalline and amorphous metals.
Schuster, Brian Elias.

Micro-pillar compression of nanocrystalline and amorphous metals. - 168 p.

Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3220.

Thesis (Ph.D.)--The Johns Hopkins University, 2008.

Microcompression can be described as compression testing of micrometer-sized specimens between a relatively rigid platen (a diamond flat-punch indenter) and a compliant specimen base, where the specimen is fixed to this base. We will introduce the details of specimen fabrication where a wide array of specimen geometries can be fabricated including those with non-uniform cross-sections, different aspect ratios, and different base geometries (and constraints). Using simulations and theoretical calculations, we examined the effect of the specimen geometry on the measured elastic and plastic response.

ISBN: 9780549620501Subjects--Topical Terms:

783786
Engineering, Mechanical.

Micro-pillar compression of nanocrystalline and amorphous metals.
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100 1 $a Schuster, Brian Elias. $3 1669181
245 1 0 $a Micro-pillar compression of nanocrystalline and amorphous metals.
300 $a 168 p.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3220.
500 $a Adviser: Kaliat T. Ramesh.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 2008.
520 $a Microcompression can be described as compression testing of micrometer-sized specimens between a relatively rigid platen (a diamond flat-punch indenter) and a compliant specimen base, where the specimen is fixed to this base. We will introduce the details of specimen fabrication where a wide array of specimen geometries can be fabricated including those with non-uniform cross-sections, different aspect ratios, and different base geometries (and constraints). Using simulations and theoretical calculations, we examined the effect of the specimen geometry on the measured elastic and plastic response.
520 $a We have made a number of measurements on the mechanical properties of materials that are generally not well-suited for traditional compression testing including nanocrystalline metals (nickel and tantalum) and a two-phase particle reinforced metallic glass composite. In nanocrystalline nickel, we have examined the compressive response of an electrodeposited foil that is only &sim;100 to 150 mum thick. While the grain size of this material is roughly &sim;30 nm, the specimens used are &sim;5 to 20 mum in diameter. The material response is essentially "bulk" because as many as &sim;1 billion grains could be found in a single micro-pillar. We have made some preliminary comparisons of the tensile and compressive properties. These low strain hardening materials are particularly prone to plastic buckling in microcompression which complicates the analysis.
520 $a In the most detailed application, we compare the bulk and micro-scale compressive response of a Pd-based metallic glass. We have examined the dependence of specimen size on the strength and deformation mechanisms for Pd40 Ni40P20, with specimen sizes ranging from sub-micron to several millimeters in diameter. At all sizes, plastic flow is localized in shear bands, which are accompanied by sudden strain bursts in the load-controlled micro-scale tests. This metallic glass shows only a modest (&sim;9%) increase in the 0.2% offset yield strength in going from bulk to micrometer-sized specimens. Stress gradients in tapered specimens dramatically complicate measurement of the intrinsic properties of metallic glasses. Our application of the shear plane yield criterion in tapered micro-specimens reinforces the notion that metallic glasses possess relatively size-independent mechanical properties.
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650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 $a The Johns Hopkins University. $3 1017431
773 0 $t Dissertation Abstracts International $g 69-05B.
790 1 0 $a Ramesh, Kaliat T., $e advisor
790 $a 0098
791 $a Ph.D.
792 $a 2008
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