Diffraction strain measurements in a partially crystallized bulk metallic glass composite containing ductile particles

Dorian K. Balch, Ersan Üstündag, David C. Dunand*

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Özet

In situ diffraction experiments were performed with high-energy synchrotron X-rays to examine load partitioning and high-stress relaxation during uniaxial compression of a bulk metallic glass composite containing both ductile tantalum particles and crystallized matrix material. The tantalum particles yielded at an applied stress of -800 MPa, while the matrix precipitates remained elastic up to the maximum applied stress of -1250 MPa. The von Mises effective stress in the tantalum particles at yielding was 1500 MPa, well in excess of typical tantalum yield stresses, which is attributed to a combination of solid-solution strengthening and the inhibition of dislocation motion in the 1-2 μm particles. A series of constant crosshead-position measurements made at -1250 MPa suggested the possibility of room-temperature matrix relaxation under high applied loads.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)176-180
Sayfa sayısı5
DergiJournal of Non-Crystalline Solids
Hacim317
Basın numarası1-2
DOI'lar
Yayın durumuYayınlandı - Mar 2003
Harici olarak yayınlandıEvet
EtkinlikAdvances in Metallic Glasses - Seattle, WA, United States
Süre: 17 Şub 200221 Şub 2002

Finansman

This study was supported by the Center for Structural Amorphous Metals (ARO grant no. DAAD19-01-0525). D.K.B. gratefully acknowledges the Department of Defense for support in the form of an NDSEG Fellowship. E.U. was supported by the Army Research Office (grant no. DAAD19-00-1-0379). The authors are grateful to Dr H. Choi-Yim (California Institute of Technology) for fabricating the specimen and for helpful discussions. The diffraction experiment was performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) at the Advanced Photon Source, the help of whose staff is greatly appreciated. DND-CAT is supported by the E.I. DuPont de Nemours & Co., The Dow Chemical Company, the US National Science Foundation through Grant DMR-9304725 and the State of Illinois through the Department of Commerce and the Board of Higher Education Grant IBHE HECA NWU 96. Use of the Advanced Photon Source was supported by the US Department of Energy, Basic Energy Sciences, Office of Energy Research under contract no. W-31-102-Eng-38.

FinansörlerFinansör numarası
Board of Higher EducationIBHE HECA NWU 96
Center for Structural Amorphous Metals
Office of Energy ResearchW-31-102-Eng-38
National Science FoundationDMR-9304725
U.S. Department of Defense
U.S. Department of Energy
Army Research OfficeDAAD19-00-1-0379, DAAD19-01-0525
U.S. Department of Commerce
Dow Chemical Company
DuPont
Basic Energy Sciences

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