Effect of helium on high-temperature tensile properties and swelling of vanadium and vanadium alloys

Conference · Mon Jan 01 04:00:00 EST 1973

OSTI ID:4427852

Santhanam, A T

From fifth symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). Sheet tensile samples of V-15 wt% Cr-5 wt% Ti were implanted with ~25 atomic ppM of helium at the ANL Cyclotron and tested at temperatures from 650 to 900 deg C. When compared with the control samples, the helium-injected samples show an increasing loss of ductility with increasing temperatures above 700 deg C. The loss of ductility in the helium- injected samples is accompanied by transition from a ductile, transgranular fracture to a completely intergranular fracture. The control samples fracture transgranularly throughout the range of test temperature. The effect of helium on void swelling was studied in two grades of vanadium using heavy-ion bombardment. High-purity vanadium (145 ppM C + N + O) and commercial-purity vanadium (1220 ppm C + N + O) were bombarded with 3.25-MeV Ni/sup +/ ions at 650 and 750 deg C to a damage level of 60 displacements per atom after preinjection with helium. Quantitative microscopy of the irradiated samples showed that the overall swelling was unaffected at 650 deg C, but was significantly reduced at 750 deg C, if the helium content was increased from 10 to 100 atomic ppM. The reduction in swelling appears to be associated with the presence of a high concentration of small helium bubbles that act as the predominant sinks for the radiation-induced point defects. (auth)

• Research Organization: Argonne National Lab., Ill. (USA)
• NSA Number: NSA-29-008347
• OSTI ID: 4427852
• Report Number(s): CONF-731114--14
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*CHROMIUM ALLOYS-- PHYSICAL RADIATION EFFECTS
*THERMONUCLEAR REACTORS-- REACTOR MATERIALS
*TITANIUM ALLOYS-- PHYSICAL RADIATION EFFECTS
*VANADIUM BASE ALLOYS-- PHYSICAL RADIATION EFFECTS
*VANADIUM-- PHYSICAL RADIATION EFFECTS
HELIUM
HELIUM IONS
HIGH TEMPERATURE
ION BEAMS
ION IMPLANTATION
N50240* --Metals
Ceramics
& Other Materials--Metals & Alloys--Radiation Effects
N70800 --Physics--Controlled Thermonuclear Research--Thermonuclear Engineering & Equipment
NICKEL IONS
POINT DEFECTS
SHEETS
SWELLING
VERY HIGH TEMPERATURE
VOIDS