FRACTURE CHARACTERISTICS OF TITANIUM-BASED INTERMETALLIC COMPOUND TI3AL

被引：2
|
作者：
NIINOMI, M
KOBAYASHI, T
RYUGOH, K
WILLIAMS, JC
GARRISON, WM
THOMPSON, AW
机构：
[1] CARNEGIE MELLON UNIV, DEPT MET ENGN & MAT SCI, PITTSBURGH, PA 15213 USA
[2] GE, DIV AIRCRAFT ENGINE, CINCINNATI, OH 45215 USA
来源：
JOURNAL OF THE JAPAN INSTITUTE OF METALS | 1991年 / 55卷 / 09期
关键词：
INTERMETALLIC COMPOUND; FRACTURE MECHANISM; FRACTURE TOUGHNESS TEST; FATIGUE PERCRACK; CRACK INITIATION POINT; ACOUSTIC EMISSION METHOD; COMPLIANCE CHANGE RATE METHOD; MULTIPLE SPECIMEN METHOD; MICROCRACK; SLIP BAND;
D O I：
10.2320/jinstmet1952.55.9_1023
中图分类号：
学科分类号：
摘要：
Accurate fracture toughness test methods on the Nb added titanium-based intermetallic compound Ti3Al using three point bending specimens were examined. Then, microfracture mechanism of this intermetallic compound was also studied. Load-deflection curves indicated elastic-plastic behavior in both static and dynamic fracture toughness tests. Crack-initiation points were evaluated by the acoustic emission (AE) method, the compliance change rate method and the multiple specimen method. It was found that there was good agreement among them under static conditions. Fracture toughness values obtained using notched specimens with various root radii were in good agreement with those obtained using fatigue-precracked specimens tested under both static and dynamic conditions. Microcracks, debonding of alpha-2(Ti3Al)-beta-o(Ti2NbAl) interface, planar slip bands and a planar dislocation structure were observed near the crack tip. The planar dislocation structure in the alpha-2 phase had a trend to concentrate to near the alpha-2-beta-o interface under dynamic conditions.
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页码：1023 / 1030
页数：8
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