Influence of intercrystal misorientation angle on brittleness of tungsten bicrystals (in Russian)
Journal Article
·
· Fiz. Metal. Metalloved., v. 36, no. 1, pp. 135-139
OSTI ID:4403664
It is knowm that grain boundaries have a great effect on the lowtemperature brittleness of tungsten which in the single-crystal state possesses significant reserves of plasticity. It is believed that brittleness ensues with the appearance of high-angle grain boundaries in tungsten. The effects of intercrystallite boundaries with a different misorientation on the brittleness of tungsten were investigated. Bending tests were run on bicrystal platelets 1 mm thick, 6 to 8 mm wide and 35 mm long. The distance between support points was 16 mm. The load was applied at a rate of 20 mm/min at the site of the intercrystallite boundary. The bending deflection was measured before breaking of the sample. The surface of the break was investigated under an optical microscope. With a boundary misorientation of less than 6 deg the bicrystal samples show a high plasticity characteristic of singlecrystal tungsten. With a boundary misorientation exceeding 6 deg , all the bicrystal samples turned out to be brittle. The greatest fall in plasticity occurs at a 6 to 8 deg misorientation angle. The brittleness of bicrystals at misorientations greater than 6 deg is caused by a decrease in strength of the intercrystallite boundary. No microcracks could be found at boundaries with a misorientation less than 6 deg . (tr-auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-003082
- OSTI ID:
- 4403664
- Journal Information:
- Fiz. Metal. Metalloved., v. 36, no. 1, pp. 135-139, Journal Name: Fiz. Metal. Metalloved., v. 36, no. 1, pp. 135-139; ISSN FMMEA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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