Helium gas bubble lattices in face-centred-cubic metals

摘要: ION irradiation of metals with helium or hydrogen isotopes commonly results in the formation microscopic gas bubbles. At very high doses, radiation blistering and related phenomena can cause severe damage to surfaces1. Much research has been stimulated by need find materials acceptable erosion loading properties for use future controlled thermonuclear reactors. Bubble is also important fission-reactor fuel technology other applications2,3. The underlying bubble structure face-centred-cubic (f.c.c.) remained largely unknown, although much done on depth profiling light gases implanted doses (see, example, refs 3–5). Inert-gas bubbles lying a space lattice have reported previously only body-centred-cubic (b.c.c.) metal molybdenum6,7. There many observations, mainly b.c.c. metals, similar ordering voids produced particle irradiation8,9. void spacing typically 5–10 times that found (∼5 nm). We report here several f.c.c. 30 keV helium-ion level just below critical dose blistering. A new result this class lie superlattice having an principal axes aligned those matrix.