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bear2002_0

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[资源] 13篇 SCI papers - Amorphous metal foams

很不错的非晶态泡沫的13篇sci文章，大家支持一下，谢谢了。

http://www.namipan.com/d/Papers- ... 7205f4175e8eb418300
http://www.namipan.com/d/Papers-%20Amorphous%20metal%20foams.rar/e68b1f98dffdbdc5c199f39480c8e7205f4175e8eb418300

1.Intermetallics

Title: Acoustic emissions analysis of damage in amorphous and crystalline metal foams

A.H. Brothers, D.W. Prine, D.C. Dunand

Abstract
Acoustic emission methods are used to investigate the nature and evolution of microfracture damage during uniaxial compression of ductile amorphous and brittle crystalline metal foams made from a commercial Zr-based bulk metallic glass, and to compare this behavior against that of aluminum-based foam of similar structure. For the amorphous foam, acoustic activity reveals evolution of the damage process from diffuse to localized damage through the foam stress plateau region, and reversion back towards diffuse damage in the foam densification region. Accommodation of microfracture by surrounding ductile struts, and significant point contact formation, permit high average compressive strains of ca. 80% in the amorphous foam without macroscopic failure.

2.Scripta Materialia

Title: Amorphous Fe-based metal foam

Marios D. Demetriou, Gang Duan, Chris Veazey

Abstract:
A foam synthesis method that takes advantage of the viscous high-temperature liquid state of Fe-based bulk glass-forming alloys to produce amorphous steel foam is introduced. Zirconium hydride is utilized as a foaming agent taking advantage of the low hydrogen solubility of these glass-forming alloys. Amorphous foams with porosities up to 65% were produced having homogenous cellular morphologies that exhibit cell-size uniformity. Even though intracellular solid regions as thin as a few micrometers are detected, on a global scale the cellular structure is determined to be incapable of alleviating the foam from the brittle nature of the monolithic glass.

3.Scripta Materialia

Title: Amorphous metal foams

A.H. Brothers, D.C. Dunand

Abstract
As recently demonstrated, amorphous metal foams are highly ductile in compression, and thus offer attractive compromises in mechanical and physical properties between crystalline metallic and ceramic foams. Challenges associated with fabrication of amorphous metal foams are critically assessed in the context of current and future processing methods, and conclusions are drawn regarding the properties and future applications of ductile amorphous metal foams.

4. APPLIED PHYSICS LETTERS

Title: Amorphous metallic foam

Jan Schroers, Chris Veazey, and William L. Johnson

Abstract
The bulk glass forming alloy Pd43Ni10Cu27P20 is processed into a low-density amorphous metallic foam. Pd43Ni10Cu27P20 is mixed with hydrated B2O3 , which releases gas at elevated temperature and/or low pressure. Very homogeneous foams are achieved due to the high viscosity of the alloy even at its liquidus temperature. By processing at the liquidus temperature and decreasing the pressure to 1022 mbar, well-distributed bubbles expand to foam the material. Foam densities as low as 1.43103 kg/m3 were obtained, corresponding to a bubble volume fraction of 84%. The bubble diameter ranges between 231024 and 131023 m. Thermal analysis by differential scanning calorimetry confirms the amorphous nature of the foam. Furthermore, it reveals that the foam’s thermal stability is comparable to the bulk material.

5.JOURNAL OF APPLIED PHYSICS

Title: Amorphous Mg-based metal foams with ductile hollow spheres

A. H. Brothers and D. C. Dunand

Abstract
To date, high compressive ductility and energy absorption have been achieved in amorphous metal foams based on high-toughness Pd- and Zr-based metallic glasses and are known to result from two extrinsic toughening mechanisms: bending of struts and shear band arrest by pores. We study here a syntactic amorphous metallic foam produced by infiltration of a bed of hollow crystalline iron spheres with a low-toughness Mg-based metallic glass Mg60Cu21Ag7Gd12. After quenching to vitrify the matrix, this foam exhibits much higher compressive failure strain and energy absorption than the monolithic metallic glass, an improvement which is assigned to an intrinsic mechanism, i.e., composite toughening by the network of hollow ductile iron spheres.

6.Materials Science and Engineering A

Title: Expansion evolution during foaming of amorphous metals

Marios D. Demetriou , Chris Veazey , Jan Schroers

Abstract
Amorphous Pd43Ni10Cu27P20 foam of 38, 49, and 70% porosity is produced by expanding a 25% porosity amorphous precursor in the supercooled liquid state in three isothermal stages of varying durations. Metallographic examination suggests that expansion evolves by bubble growth towards a limit at which bubbles become critically packed. This limit is found to be close to the limit of random close packing of spheres of 63.7%. Beyond this critical limit, bubbles tend to impinge and coalesce and expansion progresses by growth of bubble clusters via stretching of intracellular membranes. The expansion evolution is modeled by means of a dynamic treatment of over-damped growth of individual bubbles. The model captures the expansion evolution reasonably well up to porosities between 50–70%, hence verifying that a transition from a bubble growth mechanism to a cluster growth mechanism takes place at some intermediate porosity.

7.Materials Science and Engineering A

Title: Improved mechanical properties of bulk glassy alloys containing spherical pores

Akihisa Inoue, Takeshi Wada, Dmitri V. Louzguine-Luzgin

Abstract
For future extension of application fields for bulk glassy alloys, it is important to develop a newtype of glassy alloys which exhibit simultaneously high strength, low Young’s modulus, large elastic elongation, high ductility, high corrosion resistance, low density, high specific surface area, etc. Considering that bulk glassy alloys in non-ferrous metal base systems possess unique characteristics of high strength, low Young’s modulus, large elastic elongation, high fracture toughness and high corrosion resistance, they are expected to become an important candidate material for structural applications. One of theways to develop a newmaterial with the above-described properties is to fabricate ductile bulk glassy alloys containing open or closed pores in a wide range of volume fraction. Mechanical properties of closed-pore type porous bulk glassy alloys are presented. Moreover, in the present work, we review our recent work on the porous glassy Pd42.5Cu30Ni7.5P20 alloys and present an analysis of stress concentration around spherical pores.

8.Metal foams: a design guide
Butterworth-Heinemann, Oxford, UK, ISBN 0-7506-7219-6, Published 2000, Hardback, 251 pp., $75.00

9.Scripta Materialia

Title: Processing and structure of open-celled amorphous metal foams

A.H. Brothers, R. Scheunemann, J.D. DeFouw, D.C. Dunand

Abstract
Amorphous metallic foams with an open-cell structure are processed with the salt replication method by infiltration of a sintered salt pattern with liquid Vit106, a Zr-based bulk metallic glass. After pattern removal in nitric acid, the Vit106 foams exhibit highly uniform pores, about 250lm in size, and relative densities in the range 15–22%. Processing parameters, including pattern selection, sintering, and removal, are investigated.

10.Materials Science and Engineering A

Title: Production of bulk glassy alloy foams by high pressure hydrogen

Takeshi Wada, Akihisa Inoue

Abstract
A Pd–Cu–Ni–P bulk glassy alloy foam was fabricated by water quenching under pressurized hydrogen atmosphere and subsequent annealing above glass transition temperature under vacuum. At the water-quenching stage, a high density of fine bubbles is introduced. At the subsequent annealing stage, hydrogen atoms precipitate from the glassy phase to bubbles and then bubble expansion takes place above glass transition temperature. The fine and uniform structure of the foam seems to result from the formation of a high density of fine bubbles caused by high atmosphere hydrogen pressure.

11.APPLIED PHYSICS LETTERS

Title: Syntactic bulk metallic glass foam

A. H. Brothers and D. C. Dunand

Abstract
An amorphous metal foam with a bulk density of 3.4 g/cm3 is created by low-pressure melt infiltration of the bulk metallic glass-forming alloy Zr57Nb5Cu15.4Ni12.6Al10 into a bed of hollow carbon microspheres, followed by rapid quenching. The foam consists of a glassy metallic matrix containing ;60 vol.% of homogenously distributed carbon microspheres, 25–50 mm in diameter, with small amounts of ZrC at the interface. An amorphous foam with 5 mm diameter showed no measurable loss in thermal stability as compared to the amorphous alloy in bulk form.

12.JOURNAL OF APPLIED PHYSICS

Title: Synthesis method for amorphous metallic foam

Jan Schroers,Chris Veazey, Marios D. Demetriou, and William L. Johnson

Abstract
A synthesis method for the production of amorphous metallic foam is introduced. This method utilizes the thermodynamic stability and thermoplastic formability of the supercooled liquid state to produce low-density amorphous metallic foams in dimensions that are not limited to the critical casting thickness. The method consists of three stages: the prefoaming stage, in which a large number of small bubbles are created in the equilibrium liquid under pressure; the quenching stage, in which the liquid prefoam is quenched to its amorphous state; the foam expansion stage, in which the amorphous prefoam is reheated to the supercooled liquid region and is processed under pressures substantially lower than those applied in the prefoaming step. Results from a dynamic model suggest that the foam expansion process is feasible, as the kinetics of bubble expansion in the supercooled liquid region are faster than the kinetics of crystallization. Within the proposed synthesis method, bulk amorphous foam products characterized by bubble volume fractions of as high as 85% are successfully produced.

13.Journal of Alloys and Compounds

Title: Thermo-plastic expansion of amorphous metallic foam

Marios D. Demetriou, Chris Veazey, Jan Schroers,Jay C. Hanan, William L. Johnson

Abstract
Amorphous Pd43Ni10Cu27P20 foam is produced at 38%, 49%, and 70% porosity by isothermally expanding a 25%-porosity amorphous precursor in the supercooled liquid state for varying durations. The foam morphologies exhibit good spatial homogeneity as well as good size uniformity of bubbles, which is a consequence of the high viscosity of the supercooled liquid state which inhibits floatation and dampens the growth kinetics. The expansion capability of amorphous metals into high-porosity foam demonstrated in this study is attributed to the plastic deformability of the supercooled liquid state, which enables large plastic membrane elongations during foaming.

[ Last edited by hslining on 2009-9-21 at 23:34 ]

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