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Fatigue and fracture of bulk metalli...

Launey, Maximilien E.

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Fatigue and fracture of bulk metallic glasses: Role of free volume.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Fatigue and fracture of bulk metallic glasses: Role of free volume./
作者:	Launey, Maximilien E.
面頁冊數:	107 p.
附註:	Adviser: Jamie J. Kruzic.
Contained By:	Dissertation Abstracts International68-07B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3276937
ISBN:	9780549151647

Fatigue and fracture of bulk metallic glasses: Role of free volume.
Launey, Maximilien E.

Fatigue and fracture of bulk metallic glasses: Role of free volume. - 107 p.

Adviser: Jamie J. Kruzic.

Thesis (Ph.D.)--Oregon State University, 2007.

Deformation of metallic glasses requires the existence of free volume to allow atomic movement under mechanical loading. Accordingly, the present research seeks understand how free volume variations in alloys of identical compositions affect the fatigue and fracture behavior. By annealing below the glass transition temperature, free volume of a Zr-based bulk metallic glass was varied via structural relaxation. Differential scanning calorimetry was used to quantify enthalpy differences between relaxed and as-cast materials which are then related to free volume differences. Although structural relaxation showed a pronounced effect in reducing the fracture toughness, a reduction in free volume increases the fatigue strength of the bulk amorphous alloy. Mechanistically, the fatigue properties associated with a free volume variation differ significantly with respect to crack initiation. Surprisingly, the fatigue crack-growth behavior was found to be relatively insensitive to bulk free volume differences. Depth-profiled Doppler broadening spectroscopy (DBS) was utilized to perform local depth profiling of fatigue fracture surfaces to characterize local free volume differences. It's demonstrated that the intense deformation near a fatigue crack tip result in a local increase in free volume, which in turn determines the local flow properties. The effect of residual stresses on the fatigue and fracture behavior was also investigated. The superimposition of compressive stresses induced by thermal tempering during processing was found to retard fatigue crack propagation and to improve the fracture toughness.

ISBN: 9780549151647Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Fatigue and fracture of bulk metallic glasses: Role of free volume.
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245 1 0 $a Fatigue and fracture of bulk metallic glasses: Role of free volume.
300 $a 107 p.
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500 $a Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4764.
502 $a Thesis (Ph.D.)--Oregon State University, 2007.
520 $a Deformation of metallic glasses requires the existence of free volume to allow atomic movement under mechanical loading. Accordingly, the present research seeks understand how free volume variations in alloys of identical compositions affect the fatigue and fracture behavior. By annealing below the glass transition temperature, free volume of a Zr-based bulk metallic glass was varied via structural relaxation. Differential scanning calorimetry was used to quantify enthalpy differences between relaxed and as-cast materials which are then related to free volume differences. Although structural relaxation showed a pronounced effect in reducing the fracture toughness, a reduction in free volume increases the fatigue strength of the bulk amorphous alloy. Mechanistically, the fatigue properties associated with a free volume variation differ significantly with respect to crack initiation. Surprisingly, the fatigue crack-growth behavior was found to be relatively insensitive to bulk free volume differences. Depth-profiled Doppler broadening spectroscopy (DBS) was utilized to perform local depth profiling of fatigue fracture surfaces to characterize local free volume differences. It's demonstrated that the intense deformation near a fatigue crack tip result in a local increase in free volume, which in turn determines the local flow properties. The effect of residual stresses on the fatigue and fracture behavior was also investigated. The superimposition of compressive stresses induced by thermal tempering during processing was found to retard fatigue crack propagation and to improve the fracture toughness.
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