TY  - JOUR
AU  - Qu, D.
AU  - Gaganidze, E.
AU  - Vaßen, R.
AU  - Aktaa, J.
TI  - Determination of interface toughness of functionally graded tungsten/EUROFER multilayer at 550 °C by analytical and experimental methods
JO  - Engineering fracture mechanics
VL  - 202
SN  - 0013-7944
CY  - Kidlington
PB  - Elsevier Science
M1  - FZJ-2019-01247
SP  - 487 - 499
PY  - 2018
AB  - As armor coating, functionally graded (FG) tungsten/EUROFER multilayer was sprayed on EUROFER substrate for First Wall application in fusion field. Interface toughness between FG tungsten/EUROFER multilayer and EUROFER substrate was studied innovatively by a simple method based on the beam theory in this paper. To quantify interface toughness, the energy release rate was assessed by performing three and four-point bending tests on pre-cracked specimens at 550 °C and under high vacuum. The energy release rate during propagating of interfacial crack was determined to be 258 J/m2 and 225 J/m2 analytically and experimentally for samples with 3 and 5 layers as FG-layer, respectively, which were calculated based on multi bending tests. Cross-section and fracture microstructure show a vast of plasticity in FG-layer, particularly in FG-layer with a higher volume ratio of EUROFER. Interfacial fracture microstructure indicates interface adhesion consists of mechanical interlocking and metallurgical bonding.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000449274300032
DO  - DOI:10.1016/j.engfracmech.2018.09.016
UR  - https://juser.fz-juelich.de/record/860511
ER  -