Accession Number:

AD0813026

Title:

EFFECTS OF HYDROGEN TREATMENT ON THE DUCTILITY OF MOLYBDENUM UNDER 760 AND 10 TO THE MINUS 10TH POWER TORR.

Descriptive Note:

Rept. for Mar 65-Jun 66,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA LABS DIV

Personal Author(s):

Report Date:

1967-01-01

Pagination or Media Count:

19.0

Abstract:

Room-temperature tensile experiments on polycrystalline molybdenum indicate a grain size and heat treatment contribution to the difference in strain-to-fracture of specimens deformed at 760 Torr to those deformed at 10 to the -10th power Torr. The magnitude of the effect appears to depend critically on grain size and impurity distributions resulting from heat treatment with and without a hydrogen atmosphere. However, it has been determined that the ductility effects are predominantly due to a change in ductility of specimens tested at atmospheric pressure. Ultrahigh vacuum tensile behaviors are relatively unaffected. The largest difference in strain-to-fracture approximately 13 was in a narrow grain-size range in which specimens were first recrystallized and then soaked in a hydrogen atmosphere. The enhancement of ductility of hydrogen-treated specimens under vacuum suggests the involvement of a hydrogen-related gaseous contaminant. Author

Subject Categories:

  • Metallurgy and Metallography
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE