Impurity atom-dislocation interactions and subsequent effects on mechanical properties of refractory metals

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086 0 ‡aD 301.45/26-3:62-11
088 ‡aAD 276195
088 ‡aASD TDR 62-11
100 1 ‡aAdams, M. A., ‡eauthor.
245 1 0 ‡aImpurity atom-dislocation interactions and subsequent effects on mechanical properties of refractory metals / ‡cM.A. Adams and H. Nesor.
264 1 ‡aWright-Patterson Air Force Base, Ohio : ‡bAeronautical Systems Division, Air Force Systems Command, United States Air Force, ‡c1962.
300 ‡aiv, 25 pages : ‡billustrations, tables ; ‡c28 cm.
336 ‡atext ‡btxt ‡2rdacontent
337 ‡aunmediated ‡bn ‡2rdamedia
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490 0 ‡aAeronautical Systems Division (U.S.). Technical Documentary Report ; ‡vASD TDR 62-11
500 ‡aAD0276195 (from http://www.dtic.mil).
500 ‡a"March 1962."
504 ‡aIncludes bibliographical references (page 13).
520 3 ‡aStudies were made of (1) the strain-aging behaviour and (2) the effect of pre-straining and high temperature annealing of Mo crystals of two different purity levels prepared by electron beam melting. One batch of crystals contained an average of 20 ppm total interstitial impurities, the other an average of 250 ppm interstitials with the major constituent being carbon. Yield point experiments revealed no strain-aging in either material in the ''as-grown'' condition, but after a high temperature anneal followed by rapid cooling the material containing C showed appreciable aging effects, and the purer material weak effects. The results are explained in terms of the low solid solubility of the interstitial elements in Mo under equilibrium conditions at moderate temperatures. The second series of experiments showed that pre-straining and annealing treatments which produce a substructure in Mo, also result in a strengthening of the material. The strengthening increases with increasing pre-strain and with increasing C content. The results indicate that sub-grain boundaries strengthen Mo in a qualitatively similar way to ordinary grain boundaries.
536 ‡aResearch supported by the United States Air Force, Air Force Systems Command, and performed by Materials Research Corporation under Air Force contract no. ‡bAF 33(616)-7596 ‡f7351 ‡g73501.
538 ‡aMode of access: Internet.
650 7 ‡aRefractory materials. ‡2fast ‡0(OCoLC)fst01092688
650 7 ‡aMetals ‡xHeat treatment. ‡2fast ‡0(OCoLC)fst01018137
650 7 ‡aHeat resistant alloys. ‡2fast ‡0(OCoLC)fst00953953
650 7 ‡aCrystals ‡xStructure. ‡2fast ‡0(OCoLC)fst00884694
650 7 ‡aCrystal lattices. ‡2fast ‡0(OCoLC)fst00884625
650 0 ‡aMetals ‡xHeat treatment.
650 0 ‡aCrystals ‡xStructure.
650 0 ‡aCrystal lattices.
650 0 ‡aRefractory materials.
650 0 ‡aHeat resistant alloys.
700 1 ‡aNesor, H., ‡eauthor.
710 1 ‡aUnited States. ‡bAir Force. ‡bSystems Command. ‡bAeronautical Systems Division, ‡esponsor.
710 2 ‡aMaterials Research Corporation, ‡esponsor.
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