モリブデンの脆性におよぼす予歪の効果について

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  • Effect of Prestraining on the Brittleness of Molybdenum
  • モリブデン ノ ゼイセイ ニ オヨボス ヨ ワイ ノ コウカ ニ ツイテ

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The effect of prestraining by tension on the brittleness of electron beam melted pure molybdenum was studied and the following conclusions were obtained:<BR>(1) The brittleness of the recrystallized pure molybdenum sheets can be improved considerablly below room temperature by prestraining about 5∼10% in the ductile range. The effect of prestraining increases with the amount of prestrain and changes with the temperature at which prestrain was given.<BR>(2) The prestrained specimens containing many edge dislocations show better ductility at low temperature than the prestrained specimens containing many screw dislocations.<BR>(3) Strain ageing due to interstitial impurities is negligible below 300°C.<BR>(4) As an important mechanisum, free dislocations and some Frank-Read sources introduced by the prestraining release the stress concentration when the prestrained specimens were tensile-tested at lower temperature, and the brittleness can be improved.<BR>(5) Ageing at 500°C after prestraining at 300°C decreases the ductility of prestrained specimens at low temperature. This is due to the dislocation locking caused by the interstitial impurities.

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