Blister formation in multiple energy He/sup +/ implanted stainless steel

Conference · Wed Dec 01 04:00:00 EST 1976

OSTI ID:7328593

Wilson, K L; Haggmark, L G; Langley, R A

A series of multiple energy He/sup +/ implantations has been conducted on type 316 stainless steel at 575 and 775 K. Pre-implantations with 3, 10 and 15 keV He/sup +/ were used to create a series of uniform helium concentrations to a depth of approximately 700 A. The effects of these pre-implantation helium concentrations on subsequent 20 keV bombardment were studied by gas re-emission and scanning electron microscopy. If was found that serious blistering and exfoliation would occur unless the pre-implantation helium concentration was approximately greater than 0.3 atom fraction from the surface to nearly the depth of the 20 keV implant. At this pre-implant level, an interconnected pathway to the surface developed, allowing helium release without surface blistering. Evidence for rapid helium mobility along the interconnection was found at temperatures as low as 80K. These results indicate that multiple energy implantation will still produce extensive surface deformation if the helium accumulates to a local critical concentration before an interconnected pathway develops. Until detailed first wall particle fluxes are available, He/sup +/ induced surface exfoliation cannot be ruled out as a potentially serious source of wall erosion and plasma contamination in a MFE reactor.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: E(29-1)-789
• OSTI ID: 7328593
• Report Number(s): SAND-76-8688; CONF-761049-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
FIRST WALL
HEAT RESISTING ALLOYS
HELIUM IONS
HIGH TEMPERATURE
ION IMPLANTATION
IRON ALLOYS
IRON BASE ALLOYS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
SWELLING
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTOR WALLS