발간논문

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Vol.36, No.5, 691 ~ 697, 1998
Title
The Fracture Behaviors of the Heat - Treated NiAl Alloys From Ring - on - Ring Disk Bend Test ( Ⅱ )
박희섭 , 고홍석 , 홍경태 , 이경섭 Hee Sub Park , Hong Seok Ko , Kyung Tae Hong , Kyung Sub Lee
Abstract
A study has been made to investigate the fracture behaviors of heat-treated polycrystalline NiAl from the controlled indentation flaw method in conjunction with the ring-on-ring disk bend test. Fracture initiated at the indentation load exceeding 196.14N. The fracture toughness was determined from an analysis of the dependence of fracture stress on the indentation load. The true fracture stress was determined by measuring acoustic emission during indentation and bending test. The fracture toughness was measured as 4.61±1.78 (MPam^(1/2)) for unheat-treated NiAl and 6.73±1.34 (MPam^(-1/2)) for 5 times cyclic heat-treated NiAl. The fracture mode of polycrystalline NiAl was primarily intergranular at room temperature, but the portion of intergranular fracture to transgranular fracture decreased in the heat-treated NiAl.
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