Metallurgical Microanalysis with the Electron Probe

Cuthill, J. R.; Wyman, L. L.; Yakowitz, H.

doi:10.1007/bf03397249

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…To eliminate polemic discussion b etween different observers examining the same or different micfosections, it was decided to standardize the anodization of t he present group of specimens so that niobium m etal assumes a "Ligh t Beryl Blue" coloration . To avoid u se of multiple names fOf similar colors, it was agreed that t h e colors obtained under these conditions best match the colors in t he Maerz and P aul Dictionary of Colo r [6] In order to verify the chemical compositions of the observed phases, numerous areas were subj ected to microspot analysis on the NBS electron probe, a description of which is cUI'l'en tly in preparation [7].…”

Section: Methodsmentioning

confidence: 99%

Intermediate phases in superconducting niobium-tin alloys

Wyman¹,

Cuthill²,

Moore³

et al. 1962

J. RES. NATL. BUR. STAN. SECT. A.

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(April 13, 1(62) .In attempting to produ ce s up erconducting " 'ire of t he niobium sheath Nb, n core type, It became app arent t h a~ r es ults were genera lly unpredictable. Metallographic examination s how~d t hat s uch matenals arc het erogeneous and contain a number of interm ediate phases. DetaIled metallographlC studies we re made on diffusion zones in which t in h ad been allowed to react with porous niobium blocks, with fu sed niobium rod, and with niobium wires, and on a number of reacted po\\"der mix t ures.The phases produced were ide ntified by anodizing to characteristic colors and by micros pot analYS IS, supplemented by some hot-stage microscope and therm a l analysis tests. On the baSIS of these observations, a tentative revised diagram is offered to illustr ate the type of reactions which occur in t he system. Th e presumabl.v desired ph.ase, Nb,Sn, is found to lie bet,,'cen the more easily form ed phases Nb •. Sn and Nb ,Sn " which a rc stable to tempcratures we ll above the peritectoid ?e. co mpoSltJ on of the .Nb,Sn. At lower temperatures t he compound Nb,Sn is formed. It IS lndlCated that t he hIgh-temperat ure treatment to react niobium a nd t in should be followed eith er by very slow cooling or by an a nneal in the 600 to 700°C range to form Nb,Sn .

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Section: Methodsmentioning

confidence: 99%

Intermediate phases in superconducting niobium-tin alloys

Wyman¹,

Cuthill²,

Moore³

et al. 1962

J. RES. NATL. BUR. STAN. SECT. A.

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“…For this purpose, the NBS electron probe microanalyzer was employed. This instrument, which enabled analyses to be made at the 2 to 4 μ level, has been described in detail elsewhere [2].…”

Section: Information Desired and Equipment Usedmentioning

confidence: 99%

Metallographic characterization of an NBS spectrometric low-alloy steel standard

Michaelis¹,

Yakowitz²,

Moore³

1964

J. RES. NATL. BUR. STAN. SECT. A.

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The s pect ro nwt ri c st a nd a rd stcc l des ignated ~B S LO\l'-Alloy Stct'l 46 . 1 \I'as ill vest igat('d by m eans of elec tro n p ro be mi croa nalys is an d q ua ntitat ivC' nwtall ograph ic t ('c hnicplcs emplo yin g a di gita l co mpu ter. El ectron probe mi croa na lY8is sho wed t he stee l to be ho mogen eo us in ni ckel a nd i ro n at t wo to fo ul' micr on s of s pat ia l r C'so lu t io n. T he a\'crage of a ll det ermin at io ns ag reed wi t h t he cc rt ifi ed values fOI' t hesc c lenw nts. Incl usio ns in the steel \I'crt' identified , class ifi ed as to size a nd s ha pe, a nd co un ted. M ean fr ec pat h data on t he in clusions were calculakd. The ASTM fcrri te grain size num be r \I'as dt'du ce d as ] 3 .. 5 for the stc>C'1 in t he un ctc hr d co ndit io n. From t he m e"n fr ce pat hs in Ferri te a nd p carii te, it wa s fo u nd t hat t he stee l is st ru ct ur a ll~' ho moge neo us at a fi ve mi cro n level. It is concluded t hat th e ho mog(, lw ity !evel CO I'l'C' f' po nds closely to th c grain size of the m atp ri a l. It is furt her co nclud ed t ha t N BS-461 steel is suffi cient ly hom ogenC'o us t hat a ny presen t mi croanalyt ical tec hnique C,lIl be carri ed o ut wi t h li tt le chance of i n acc u rac~' du e to inhomoge neity.

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“…Methods of presentation of these data in a usable form have resulted from the ingenious use of modern electronic equipment. Birks and Batt (54) used a multichannel analyzer in connection with a nondispersive system for rapid determination of all elements present in microvolumes excited by an Determinations of solid state solubility (129,151) Electron beam scanning (106,248,355) Examination of biological specimens (77,106,107,272,283,311,377,453,(469)(470)(471)(472)514) General metallurgical (90,114,175,282,298,308,309,344,351,352,501) Identification of inclusions and particles (61,222,251,262,308,368,398,399,402,460,478,494) Identification of mineral phases (106, 282, 344> 409,436,446) Segregation studies (1,…”

Section: Coatingsmentioning

confidence: 99%