The fracture behaviors of the heat-treated NiAl alloys from ring-on-ring disk bend test (II)

Title
The fracture behaviors of the heat-treated NiAl alloys from ring-on-ring disk bend test (II)
Authors
박희섭고홍석홍경태이경섭
Keywords
NiAl; Ring-on-ring test; Fracture; 금속간화합물
Issue Date
1998-05
Publisher
대한금속학회지
Citation
VOL 36, NO 5, 691-696
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.
URI
http://pubs.kist.re.kr/handle/201004/18816
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