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Title: Shock compression response of cold-rolled Ni/Al multilayer composites

Abstract

Uniaxial strain, plate-on-plate impact experiments were performed on cold-rolled Ni/Al multilayer composites and the resulting Hugoniot was determined through time-resolved measurements combined with impedance matching. The experimental Hugoniot agreed with that previously predicted by two dimensional (2D) meso-scale calculations. Additional 2D meso-scale simulations were performed using the same computational method as the prior study to reproduce the experimentally measured free surface velocities and stress profiles. Finally, these simulations accurately replicated the experimental profiles, providing additional validation for the previous computational work.

Authors:
ORCiD logo [1];  [2];  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Georgia Inst. of Technology, Atlanta, GA (United States)
  2. The Johns Hopkins Univ., Baltimore, MD (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1371476
Report Number(s):
SAND-2016-8242J
Journal ID: ISSN 0021-8979; 655050
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 1; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Specht, Paul E., Weihs, Timothy P., and Thadhani, Naresh N. Shock compression response of cold-rolled Ni/Al multilayer composites. United States: N. p., 2017. Web. doi:10.1063/1.4973578.
Specht, Paul E., Weihs, Timothy P., & Thadhani, Naresh N. Shock compression response of cold-rolled Ni/Al multilayer composites. United States. doi:10.1063/1.4973578.
Specht, Paul E., Weihs, Timothy P., and Thadhani, Naresh N. Fri . "Shock compression response of cold-rolled Ni/Al multilayer composites". United States. doi:10.1063/1.4973578. https://www.osti.gov/servlets/purl/1371476.
@article{osti_1371476,
title = {Shock compression response of cold-rolled Ni/Al multilayer composites},
author = {Specht, Paul E. and Weihs, Timothy P. and Thadhani, Naresh N.},
abstractNote = {Uniaxial strain, plate-on-plate impact experiments were performed on cold-rolled Ni/Al multilayer composites and the resulting Hugoniot was determined through time-resolved measurements combined with impedance matching. The experimental Hugoniot agreed with that previously predicted by two dimensional (2D) meso-scale calculations. Additional 2D meso-scale simulations were performed using the same computational method as the prior study to reproduce the experimentally measured free surface velocities and stress profiles. Finally, these simulations accurately replicated the experimental profiles, providing additional validation for the previous computational work.},
doi = {10.1063/1.4973578},
journal = {Journal of Applied Physics},
number = 1,
volume = 121,
place = {United States},
year = {Fri Jan 06 00:00:00 EST 2017},
month = {Fri Jan 06 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
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  • Abstract not provided.
  • The shock-compression response of Ni + Al multilayered thin foils is investigated using laser-accelerated thin-foil plate-impact experiments over the pressure range of 2 to 11 GPa. The foils contain alternating Ni and Al layers (parallel but not flat) of nominally 50 nm bilayer spacing. The goal is to determine the equation of state and shock-induced reactivity of these highly reactive fully dense thin-foil materials. The laser-accelerated thin-foil impact set-up involved combined use of photon-doppler-velocimetry to monitor the acceleration and impact velocity of an aluminum flyer, and VISAR interferometry was used to monitor the back free-surface velocity of the impacted Ni + Al multilayered target. The shock-compressionmore » response of the Ni + Al target foils was determined using experimentally measured parameters and impedance matching approach, with error bars identified considering systematic and experimental errors. Meso-scale CTH shock simulations were performed using real imported microstructures of the cross-sections of the multilayered Ni + Al foils to compute the Hugoniot response (assuming no reaction) for correlation with their experimentally determined equation of state. It was observed that at particle velocities below ∼150 m/s, the experimentally determined equation of state trend matches the CTH-predicted inert response and is consistent with the observed unreacted state of the recovered Ni + Al target foils from this velocity regime. At higher particle velocities, the experimentally determined equation of state deviates from the CTH-predicted inert response. A complete and self-sustained reaction is also seen in targets recovered from experiments performed at these higher particle velocities. The deviation in the measured equation of state, to higher shock speeds and expanded volumes, combined with the observation of complete reaction in the recovered multilayered foils, confirmed via microstructure characterization, is indicative of the occurrence of shock-induced chemical reaction occurring in the time-scale of the high-pressure state. TEM characterization of recovered shock-compressed (unreacted) Ni + Al multilayered foils exhibits distinct features of constituent mixing revealing jetted layers and inter-mixed regions. These features were primarily observed in the proximity of the undulations present in the alternating layers of the Ni + Al starting foils, suggesting the important role of such instabilities in promoting shock-induced intermetallic-forming reactions in the fully dense highly exothermic multilayered thin foils.« less
  • Defect recovery and long-range ordering (LRO) during isochronal annealing of cold-rolled Ni{sub 76}Al{sub 24} + 0.19 at% B (400 wt ppm) were studied by residual resistometry, transmission electron microscopy (TEM) and microhardness tests. The cold-rolling causes a decrease of the degree of LRO and an effective increase of the mobility of vacancies. The long-range ordering process during isochronal annealing proceeds, however, qualitatively in a similar way both in as-rolled and in homogenized samples. TEM observations revealed two stages of the defect recovery. Firstly, superlattice intrinsic stacking faults (SISF) of large density recovered almost completely in the temperature regime between 443more » and 700 K showing that they are bounded by dislocations of opposite sign. Secondly, the recovery of antiphase-boundary (APB) dissociated superlattice dislocations occurred by the annihilation of dipoles within the whole temperature regime leading finally to a loss of all dislocations at 1,273 K.« less
  • The compression behavior of powder-metallurgy (P/M) processed monolithic L1[sub 2] compounds Al[sub 66]Ti[sub 25]Mn[sub 9], Al[sub 67]Ti[sub 25]Cr[sub 8] and their 20 vol.% TiB[sub 2] particulate-containing counterparts were evaluated as a function of temperature and, at high temperatures (1,000 and 1,100 K), as a function of strain rate. Hot-pressed and deformed microstructures were examined by optical and transmission electron microscopy. Variations in strength with temperature and with strain rate at 1,000 K of the P/M-processed monolithic materials from this study are compared against previous data for similar materials obtained by ingot metallurgy processing. Observed differences are attributed predominantly to grainmore » size effects. For the composites, stress exponents and activation energies for creep were obtained using the power law creep equations which adequately describe the data. Compression studies were conducted between room temperature and [approximately]800 K on specimens of the composite material that had been subjected to various intermediate temperature heat treatments in an effort to understand qualitatively the extent to which the intrinsic matrix composition, solid solution component and precipitation strengthening (by Al[sub 2]Ti), each contributes to the observed compressive yield strength-temperature profiles.« less
  • The initiation of chemical reaction in cold-rolled Ni/Al multilayered composites by shock compression is investigated numerically. A simplified approach is adopted that exploits the disparity between the reaction and shock loading timescales. The impact of shock compression is modeled using CTH simulations that yield pressure, strain, and temperature distributions within the composites due to the shock propagation. The resulting temperature distribution is then used as initial condition to simulate the evolution of the subsequent shock-induced mixing and chemical reaction. To this end, a reduced reaction model is used that expresses the local atomic mixing and heat release rates in termsmore » of an evolution equation for a dimensionless time scale reflecting the age of the mixed layer. The computations are used to assess the effect of bilayer thickness on the reaction, as well as the impact of shock velocity and orientation with respect to the layering. Computed results indicate that initiation and evolution of the reaction are substantially affected by both the shock velocity and the bilayer thickness. In particular, at low impact velocity, Ni/Al multilayered composites with thick bilayers react completely in 100 ms while at high impact velocity and thin bilayers, reaction time was less than 100 μs. Quantitative trends for the dependence of the reaction time on the shock velocity are also determined, for different bilayer thickness and shock orientation.« less