Low-Temperature Flow and Fracture Behavior of Tantalum

Nunes, John; Anctil, Albert A; Kula, Eric B.

doi:10.1007/978-1-4684-3108-7_11

Cited by 1 publication

(2 citation statements)

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“…Wilcox et al (81,82) found a somewhat smaller increase in the ductile-tobrittle transition temperature with hydrogen content. With a strain rate None of the investigators just discussed found the ductile-brittle-ductile transition behavior, i.e., a ductility minimum at a certain temperature, that has been observed for vanadium by Roberts and Rogers (90) and Eustice and Carlson (91), and for tantalum by Nunes et al (92) and Imgram et al (S3). However, Wood and Daniels (S4) and Oakwood and Daniels (54) reported pronounced ductility minima at a temperature of approximately -116 F (-S2 C).…”

Section: The Effect Of Hydrogen On the Properties Of Columbiummentioning

confidence: 90%

“…Imgram et al (89) performed tensile tests at -105 F (-76 C) on tantalum containing 135 ppm hydrogen (H/Ta = 0.024) at four strain rates from 0.00015 per minute to 4.0 per minute and found that both strength and ductility increased with strain rate. Nunes et al (92) obtained true stress-true strain tensile properties of commercially pure tantalum at temperatures from 392 F (200 C) to -)i52 F (-269 C) using an initial strain rate of 0.01 per minute. Two groups of specimens were tested, one containing 1 ppm hydrogen and the other 7 ppm hydrogen.…”

Section: Wilcox and Hugginsmentioning

confidence: 99%

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Refractory Metal Alloys Metallurgy and Technology

Machlin¹,

Begley²,

Weisert³

1968

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Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials.Refractory metals are arbitrarily defined by melting point. A melting temperature of over 3500 0 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.Of eleven metals with melting points above 35000F, four have been advanced significantly in recent years, as bases for structural alloys, namely Cb, Mo, Ta, and W. The remaining seven (Re, 8f, Ir, Rh, Ru, Tc and Os) have received lesser development, a fact reflected in the Symposium program. Perhaps future Symposia will show a different emphasis.At the time of the first High Temperature Materials Conference in 1957 (Cleveland, Ohio) only the Mo-O.5% T1 alloy was in commercial production. Currently (1968) several dozen useful Cb, Mo, Ta, and W alloys have evolved, with many obtainable in good quality as sheet, foil, tube, wire, bar, and forgings. Although complete information on aerospace, nuclear, and commercial applications was not available for presentation at the SympoSium, it appears that refractory metals are serving essential structural functions, predominantly in prototype studies of propulsion, power generation, and hypersonic flight devices, with few requirements involving large quantities.A major factor limiting the utility of refractory metals in high temperature processes continues to be the lack of alloys (coated or otherwise) reliably operable for long times (multi-hundreds ofbours) in oxidizing environments. Nonetheless, there are several environments in which refractory metals are optimum materials, including vacua, inert gases, and liquid alkali metals. In oxidizing environments coated re-frac~ory metals can serve for limited periods, under appropriate conv vi PREFACE ditions.The U. S. capability in refractory metals for structural uses has been attained with Government support. supplemented by industry. of programs ranging from basic research to fabrication of hardware. Much work remains. if desired improvements in oxidation-resistance. strength. ductility. weldability and fabricability are to be attained. However, it appears likely that research efforts. in the future, will be selectively directed towards solving those critical problems limiting the useful potential of refractory metals. The invited papers ...

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Section: The Effect Of Hydrogen On the Properties Of Columbiummentioning

confidence: 90%

Section: Wilcox and Hugginsmentioning

confidence: 99%