00000nam 2200000za 4500 9.841739 CaOODSP 20221107152148 cr ||||||||||| 170816s1974 oncad ob f000 0 eng d CaOODSP eng eng fre n-cn--- M34-20/191E-PDF M34-20/191 Biefer, G. J., 1921- Environmental cracking behaviour of Pd-bearing Ti-7%Al-2%Nb-1%Ta alloy [electronic resource] / G.J. Biefer and A.J. Williams, Physical Metallurgy Division. Ottawa : Information Canada, 1974. iv, 25 p. : charts, ill. Technical bulletin ; TB 191 Cover title. "May 1974." Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references. “Alloys of Ti-7%Al-2%Nb-1%Ta (Ti-721) containing 0.26 to 1.56% Pd were tested in two different heat-treatment conditions. For one of these, termed "sensitized", the heat treatment was designed to favour the precipitation of α2 (Ti3Al), whereas for the other, termed "desensitized", the heat treatment was designed to suppress Ti3Al precipitation. In tests on unstressed specimens of Ti-721, it was found that an alloying addition of 0.26% Pd was sufficient to bring about passivity in strongly acid 3.5% NaCl solutions. However, improvements in resistance to environmental cracking (EC) in 3.5% NaCl solution were shown only by alloys containing 0.38 to 1.56% Pd. Ti-721 alloy containing α2 (Ti3Al) is known to be highly sensitive to EC. Despite moderate improvements imparted by palladium, the sensitized Ti-721 Pd alloys remained unacceptable in so far as resistance to EC was concerned. Desensitized Ti-721 Pd also showed improved resistance to EC at 0.38 to 1.56% Pd, these alloys showing a more acceptable level of resistance. Probably because of a solid solution strengthening mechanism, 0.75 to 1.56% Pd brought about minor increases in yield and ultimate tensile strength and also in fracture toughness. An additional slight increase in yield strength was caused by the sensitizing heat treatment at all palladium levels"--Abstract, p. i-ii. Includes abstract in French. gccst Metals Williams, A. J. Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 191 (CaOODSP)9.834857 PDF 1.15 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-191-eng.pdf 300070