Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Geoffrey H. Campbell"'
Publikováno v:
AIP Advances, Vol 10, Iss 8, Pp 085012-085012-6 (2020)
The ignition of sputter deposited nanolaminate foils comprising alternating Co and Al layers results in rapid, self-propagating formation reactions. The propagating waves present after ignition of 150 nm-thick foils are characterized in movie mode dy
Externí odkaz:
https://doaj.org/article/849eb8725bb549d987c2abce3b1429ba
Autor:
Michael D. Grapes, Thomas LaGrange, Karsten Woll, Bryan W. Reed, Geoffrey H. Campbell, David A. LaVan, Timothy P. Weihs
Publikováno v:
APL Materials, Vol 2, Iss 11, Pp 116102-116102-7 (2014)
The Al/Ni formation reaction is highly exothermic and of both scientific and technological significance. In this report, we study the evolution of intermetallic phases in this reaction at a heating rate of 830 K/s. 100-nm-thick Al/Ni bilayers were de
Externí odkaz:
https://doaj.org/article/eee55088078646a8908f2f2b892ca48c
Publikováno v:
Acta Materialia. 179:190-200
We report a novel mechanism for explosive crystallization in amorphous germanium (a-Ge), which operates through liquid-mediated nucleation occurring under extreme thermal gradient conditions. The crystallization kinetics of sputter-deposited films wi
Publikováno v:
Acta Materialia. 143:13-19
The unsteady propagation mechanism for the crystallization of amorphous germanium (a-Ge) was studied with in situ movie-mode dynamic transmission electron microscopy (MM-DTEM). Short laser pulses were used to heat sputter-deposited a-Ge films and the
Autor:
Melissa K. Santala, David A. LaVan, Michael D. Grapes, Timothy P. Weihs, Geoffrey H. Campbell
Publikováno v:
Thermochimica Acta. 658:72-83
The Al3Ni formation reaction was examined at 11 heating rates ranging from 1000 K/s to 100,000 K/s using high-rate nanocalorimetry, time-resolved electron microscopy, isoconversional analysis, and combined kinetic analysis. Two main reaction steps ar
Autor:
Amy J. Clarke, John D. Roehling, Geoffrey H. Campbell, J.C.E. Mertens, John W. Gibbs, D.R. Coughlin, J. Kevin Baldwin, Joseph T. McKeown
Publikováno v:
Acta Materialia. 131:22-30
In situ dynamic transmission electron microscope (DTEM) imaging of Al-Si thin-film alloys was performed to investigate rapid solidification behavior. Solidification of alloys with compositions from 1 to 15 atomic percent Si was imaged during pulsed l
Autor:
Luke L. Hsiung, Geoffrey H. Campbell
Publikováno v:
MRS Advances. 2:1417-1428
A TEM study of pure tantalum and tantalum-tungsten alloys explosively shocked at a peak pressure of 30 GPa (strain rate: ~1 × 104 sec-1) is presented. While no ω (hexagonal) phase was found in shock-recovered pure Ta and Ta-5W that contain mainly a
Publikováno v:
Springer Handbook of Microscopy ISBN: 9783030000684
High-speed electron microscopy has emerged as a well-established in situ transmission electron microscopy () capability that can provide observations and measurements of complex, transient materials phenomena with high spatial and temporal resolution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::379b26279bad4d7eb1a29ca49dc73ba5
https://doi.org/10.1007/978-3-030-00069-1_8
https://doi.org/10.1007/978-3-030-00069-1_8
Autor:
Kai Zweiacker, Geoffrey H. Campbell, D.R. Coughlin, John W. Gibbs, Jörg M.K. Wiezorek, Seth D. Imhoff, Damien Tourret, John D. Roehling, Paul J. Gibbs, Can Liu, J. Kevin Baldwin, Amy J. Clarke, Joseph T. McKeown
Publikováno v:
JOM. 68:985-999
Additive manufacturing (AM) of metals and alloys is becoming a pervasive technology in both research and industrial environments, though significant challenges remain before widespread implementation of AM can be realized. In situ investigations of r
Publikováno v:
Advanced Materials. 27:1060-1065
Core-shell nanostructures have attracted much attention due to their unique and tunable properties relative to bulk structures of the same materials, making core-shell nanoparticles candidates for a variety of applications with multiple functionaliti