Publications (2)0 Total impact
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Article: Tensile properties of a series of V–4Ti–4Cr alloys containing small amounts of Si, Al and Y, and the influence of helium implantation
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ABSTRACT: V–Ti–Cr type alloys containing Si, Al and Y have been developed to improve proof-oxidation properties and high temperature strength. In order to optimize the composition of Si, Al and Y, seven V–Ti–Cr type alloys containing Si, Al and Y up to 0.5 wt% were prepared. Tensile tests were carried out at temperatures from 300 to 1123 K. From the results of the tests, the dependence of yield stress and ultimate tensile strength on Si, Al and Y concentration is low at these temperatures. Total elongation of the alloys tested at 923 and 1123 K increase with increasing concentration of Si, Al and Y. Helium implantation up to about 50 appm by an accelerator was also carried out. The loss of total elongation at 923 and 1123 K depends on the concentration of Si, Al and Y. From the results of helium implantation, it is suggested that the appropriate concentration of Si, Al and Y for V–4Ti–4Cr alloys is between 0.1 and 0.5 wt%, respectively.Journal of Nuclear Materials - J NUCL MATER. 01/1998; 258:1497-1501. -
Article: Low Activation V-Ti-Cr-Si Type Alloys for Fusion Applications
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ABSTRACT: V-Ti-Cr-Si type alloys containing Al and Y were prepared for structural materials application of fusion reactors. The condition of heat treatment, tensile properties and deformation microstructures were examined for two type alloys referred as V-25Ti-15Cr and V-5Ti-5Cr. The neutron irradiation behavior was also studied. Tensile test were conducted using miniature-type specimens at temperatures from 300 to 1273K. The alloy V-25Ti-15Cr showed the strength twice as high as V-5Ti-5Cr at temperatures from 300 to 873 K. Ductility of V-5Ti-5Cr alloy was larger than that of V-25Ti-15Cr at lower temperatures. The amount of void swelling after neutron irradiation of the two alloys was very low level compared with that of various vanadium alloys. -
Article: Microstructures of High-Purity Ferritic Steels after Helium Implantation
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ABSTRACT: The purification and its influence on the property are important in developing low activation ferritic steels for fusion applications. In order to clarify the influence of purity on microstructure development in Fe-Cr alloys, the cavity formation caused by relatively high amount of helium was studied. High-purity Fe-9Cr binary alloys (99.99-99.995 wt% purity) and commercial-grade ones (99.9-99.95 wt% purity) were prepared. About 1000 appm helium associated with about 0.2 dpa was implanted into TEM disks at room temperature by using a Dynamitron accelerator with energy degrader. After post-irradiation annealing at 1123 K for 3.6 ks small cavities were observed in the high-purity alloys half in average size and 3-10 times higher in density compared with commercial-grade ones. The role of trace elements in cavity formation was discussed. ferritic steels Fe-Cr alloy low activation materials high purity alloy helium effects irradiation effects
