Neutron irradiation embrittlement of polycrystalline and single crystalline molybdenum

Irradiation hardening in unalloyed and ODS molybdenum during low dose neutron irradiation at 300°C and 600°C

“…3 indicate low strain hardening exponents of n = 0.142-0.005 (Tables 3 and 4) are observed that are consistent with the literature data for commercial molybdenum alloys [8][9][10][11][12][13][14][15][16][17][18][19][24][25][26][27][28][29][30][31][32][53][54][55][56][57][58][59][60][61]. The stress-strain data were determined from the raw load-displacement results, and no correction was made for the compliance of the load frame.…”

“…Faceted voids have been observed for molybdenum irradiated to 600°C and 900°C [44,[53][54][55][56][57][58][59][60][61]63,64]. However, clear evidence for facets has not been observed for the 300°C irradiations that may suggest the cavities are voids.…”

The change in tensile properties of wrought LCAC molybdenum irradiated with neutrons

“…This results in the formation of finely spaced clusters of point defects or fine dislocation loops during the irradiation of molybdenum at temperatures less than 800°C (black spot damage) [1][2][3][4][5][6][7][8]. The large increase in the tensile strength with a significant loss of ductility is observed for LCAC molybdenum after irradiation at temperatures 6605°C that is similar to that reported in literature [1][2][3][4][5][6][7][8][21][22][23][24][25][26][27][28][29]. Irradiation embrittlement is shown by the increase in the DBTT of LCAC from below room-temperature prior to irradiation to 600 and 300°C after irradiation at 270 and 605°C…”

Low temperature neutron irradiation effects on microstructure and tensile properties of molybdenum

“…However, Mo, like other body-centered cubic (bcc) metals, is susceptible to low temperatures embrittlement and suffers an increase in ductile-brittle transition temperature (DBTT) after neutron exposure [2][3][4][5][6][7][8][9][10][11]. The improvement in low temperature ductility of neutron-irradiated Mo is of great importance for its applications in advanced nuclear systems.…”