Lattice expansion as a measure of surface segregation and solubility of hydrogen in. cap alpha. -FeTiH/sub x/

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The lattice expansion of ..cap alpha..-FeTiH/sub x/ was found to be anomalously small as a function of hydrogen content. The apparent partial molar volume of hydrogen, anti V/sub H/, was 0.1 +- 0.1 cc/g atom (FeTiH/sub <0.03/), a value much lower than the accepted range of 2.2 to 1.4 cc/g atom previously reported for hydrogen-metal solutions. The behavior is attributed to preferential occupation by hydrogen of Ti rich sites produced by surface segregation effects which are known to occur in activated FeTi. The ..cap alpha../..cap alpha.. + ..beta.. phase boundary is estimated to occur at an overall composition equivalent to ... continued below

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Pages: 19

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Reilly, J.J.; Johnson, J.R.; Reidinger, F.; Lynch, J.F.; Tanaka, J. & Wiswall, R.H. January 1, 1980.

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The lattice expansion of ..cap alpha..-FeTiH/sub x/ was found to be anomalously small as a function of hydrogen content. The apparent partial molar volume of hydrogen, anti V/sub H/, was 0.1 +- 0.1 cc/g atom (FeTiH/sub <0.03/), a value much lower than the accepted range of 2.2 to 1.4 cc/g atom previously reported for hydrogen-metal solutions. The behavior is attributed to preferential occupation by hydrogen of Ti rich sites produced by surface segregation effects which are known to occur in activated FeTi. The ..cap alpha../..cap alpha.. + ..beta.. phase boundary is estimated to occur at an overall composition equivalent to FeTi/sub approx. 0.04/. At this composition approx. 85% of the total hydrogen content is estimated to be associated with surface layers approx. 100 A in depth. Unactivated FeTi (low surface area) behaved quite differently and it is clear that in the low dilution region surface segregation effects play a dominant role with respect to system behavior. Evidence is also presented that strain and dislocations produced by a hydriding-dehydriding cycle increase hydrogen solubility and shift the phase boundary towards higher hydrogen contents.

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Pages: 19

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NTIS, PC A02/MF A01.

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  • International symposium on the properties and applications of metal hydrides, Colorado Springs, CO, USA, 7 Apr 1980

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  • Report No.: BNL-27523
  • Report No.: CONF-800402-12
  • Grant Number: EY-76-C-02-0016
  • Office of Scientific & Technical Information Report Number: 5429025
  • Archival Resource Key: ark:/67531/metadc1064471

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  • January 1, 1980

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 23, 2018, 4:35 p.m.

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Reilly, J.J.; Johnson, J.R.; Reidinger, F.; Lynch, J.F.; Tanaka, J. & Wiswall, R.H. Lattice expansion as a measure of surface segregation and solubility of hydrogen in. cap alpha. -FeTiH/sub x/, article, January 1, 1980; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1064471/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.