Comparison of implantation-driven permeation characteristics of fusion reactor structural materials

Conference · Fri Apr 04 04:00:00 EST 1986

OSTI ID:5574060

Longhurst, G R; Anderl, R A; Struttmann, D A

Implantation-driven permeation experiments have been conducted on samples of the ferritic steel HT-9, the austenitic Primary Candidate Alloy (PCA) and the vanadium alloy V-15Cr-5Ti using D/sub 3//sup +/ ions under conditions that simulate charge-exchange neutral loading on a fusion reactor first wall. The steels all exhibited an initially intense permeation ''spike'' followed by an exponential decrease to low steady-state values. That spike was not evident in the V-15Cr-5Ti experiments. Steady-state permeation was highest in the vanadium alloy and lowest in the austenitic steel. Though permeation rates in the HT-9 were lower than those in V-15Cr-5Ti, permeation transients were much faster in HT-9 than in other materials tested. Ion-beam sputtering of the surface in the steel experiments resulted in enhanced remission at the front surface, whereas in the vanadium tests, recombination and diffusivity both appeared to diminish as the deuterium concentration rose. This may be due to a phase change in the material. We conclude that for conditions comparable to those of these experiments, tritium retention and loss in first wall structures made of steels will be less than in structures made of V-15Cr-5Ti.

• Research Organization: Idaho National Engineering Lab., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 5574060
• Report Number(s): EGG-M-27285; CONF-860421-57; ON: DE86011028
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209 -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALLOY-HT-9
ALLOYS
CHARGED PARTICLES
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
DEUTERIUM IONS
FIRST WALL
ION IMPLANTATION
IONS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
MATERIALS
PERMEABILITY
STEELS
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTOR WALLS
TITANIUM ALLOYS
VANADIUM ALLOYS
VANADIUM BASE ALLOYS