粗大結晶粒工業用純チタンにおける疲労変形の結晶学的検討
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概要
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Large grain specimens with average grain size of 10 mm made from commercial purity titanium were subjected to a cyclic plane bending. Fatigue damage was studied by optical microscopy and surface trace analysis technique. The orientation of grains was determined by X-ray back reflection Laue method designed so that X-ray photographs and optical micrographs can be taken from the same area. It was found that fatigue cracking occurred on the {1120} plane in addition to normal slip planes and twin planes. Twinning deformation was more prevalent at low stress amplitude. Fatigue cracks sometimes propagated along subboundaries formed on the {1011} plane during heat treatment. The behavior of subboundaries toward the fatigue deformation varied with the nature of subboundary such as tilt and twist subboundaries. Fatigue deformation was confined to the area close to fatigue cracks. The extensive formation of slip bands was not much observed as compared with that in fcc and bcc metals. It is proposed that the brittle-like cracking observed on the {1120} and {1010} planes was a result of dislcation reaction forming sessile a/3 dislocations on the {1120} plane.
- 山形大学の論文
- 1982-01-20