Effects Of Heat Treatment On The Structure And Mechanical Characteristics At 20-1100 deg C For Chromium Film Condensate

• Published in: Powder metallurgy and metal ceramics Vol. 43; no. 3-4; pp. 205 - 210
• Main Authors: Pisarenko, V A, Rakitskii, A N, Rogul, T G, Samelyuk, A V, Pavlov, V S
• Format: Journal Article
• Language: English
• Published: 01.03.2004
• ISSN: 1068-1302

Studies have been made on the structure, phase composition, and mechanical properties of 0.25 mm film condensates made from Cr - 0.35 La - 0.2 Ta alloy by vacuum arc sputtering on to a copper substrate at a condensation temperature of 650DGC. The specimens have been tested in tension in the initial state and after annealing at 900-1300DGC. The poor mechanical properties of the condensates at room temperature are due to the high internal stresses on account of the high density of vacancy defects within the crystallites, which can lead to failure at grain boundaries at comparatively low stresses. Annealing at 1100DGC annihilates the defects and starts recrystallization. The increase in the yield point at test temperatures of 700-800DGC is probably due to ageing which may be due to the high density of vacation defects and the high mobility of them, which is due to temperature-dependent changes. Intercrystallite failure and exfoliation at a neck in the specimen are examined during tension tests.