The key to perfect radiation endurance is perfect recovery. Since surfaces are perfect sinks for defects, a porous material with a high surface to volume ratio has the potential to be extremely radiation tolerant, provided it is morphologically stable in a radiation environment. Experiments and computer simulations on nanoscale gold foams reported here show the existence of a window in the parameter space where foams are radiation tolerant. We analyze these results in terms of a model for the irradiation response that quantitatively locates such window that appears to be the consequence of the combined effect of two length scales dependent on the irradiation conditions: (i) foams with ligament diameters below a minimum value display ligament melting and breaking, together with compaction increasing with dose (this value is typically similar to 5 nm for primary knock on atoms (PKA) of similar to 15 keV in Au), while (ii) foams with ligament diameters above a maximum value show bulk behavior, that is, damage accumulation (few hundred nanometers for the PKA's energy and dose rate used in this study). In between these dimensions, (i.e., similar to 100 nm in Au), defect migration to the ligament surface happens faster than the time between cascades, ensuring radiation resistance for a given dose-rate. We conclude that foams can be tailored to become radiation tolerant.
机构:
Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Bai, Xian-Ming
Voter, Arthur F.
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Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Voter, Arthur F.
Hoagland, Richard G.
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Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Hoagland, Richard G.
Nastasi, Michael
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Los Alamos Natl Lab, MPA CINT, Mat Phys & Applicat Div, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Nastasi, Michael
Uberuaga, Blas P.
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Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Crowson, Douglas A.
Farkas, Diana
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Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Farkas, Diana
Corcoran, Sean G.
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Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Crowson, Douglas A.
Farkas, Diana
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Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Farkas, Diana
Corcoran, Sean G.
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h-index: 0
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Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
机构:
Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Bai, Xian-Ming
Voter, Arthur F.
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h-index: 0
机构:
Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Voter, Arthur F.
Hoagland, Richard G.
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h-index: 0
机构:
Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Hoagland, Richard G.
Nastasi, Michael
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机构:
Los Alamos Natl Lab, MPA CINT, Mat Phys & Applicat Div, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
Nastasi, Michael
Uberuaga, Blas P.
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h-index: 0
机构:
Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USALos Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Crowson, Douglas A.
Farkas, Diana
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机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Farkas, Diana
Corcoran, Sean G.
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h-index: 0
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Crowson, Douglas A.
Farkas, Diana
论文数: 0引用数: 0
h-index: 0
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
Farkas, Diana
Corcoran, Sean G.
论文数: 0引用数: 0
h-index: 0
机构:
Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA