Open Access System for Information Sharing

Login Library

 

ARTICLE
Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Interpretation of Fracture Toughness and R-Curve Behavior by Direct Observation of Microfracture Process in Ti-Based Dendrite-Containing Amorphous Alloys

Title
Interpretation of Fracture Toughness and R-Curve Behavior by Direct Observation of Microfracture Process in Ti-Based Dendrite-Containing Amorphous Alloys
Authors
Jeon, CKim, CP이성학Lee, SKim, HS
Date Issued
Apr-2015
Publisher
SPRINGER
Abstract
Fracture properties of Ti-based amorphous alloys containing ductile beta dendrites were explained by directly observing microfracture processes. Three Ti-based amorphous alloys were fabricated by adding Ti, Zr, V, Ni, Al, and Be into a Ti-6Al-4V alloy by a vacuum arc melting method. The effective sizes of dendrites varied from 63 to 104 mu m, while their volume fractions were almost constant within the range from 74 to 76 pct. The observation of the microfracture of the alloy containing coarse dendrites revealed that a microcrack initiated at the amorphous matrix of the notch tip and propagated along the amorphous matrix. In the alloy containing fine dendrites, the crack propagation was frequently blocked by dendrites, and many deformation bands were formed near or in front of the propagating crack, thereby resulting in a zig-zag fracture path. Crack initiation toughness was almost the same at 35 to 36 MPaaem within error ranges in the three alloys because it was heavily affected by the stress applied to the specimen at the time of crack initiation at the crack tip as well as strength levels of the alloys. According to the R-curve behavior, however, the best overall fracture properties in the alloy containing fine dendrites were explained by mechanisms of blocking of the crack growth and crack blunting and deformation band formation at dendrites. (C) The Minerals, Metals & Materials Society and ASM International 2015
Keywords
BULK METALLIC GLASSES; MATRIX COMPOSITES; KINETICS; PLASTICITY; DISPERSIONS; PHASE; MICROSTRUCTURE; DEFORMATION-BEHAVIOR; TENSILE DUCTILITY
URI
http://oasis.postech.ac.kr/handle/2014.oak/13052
DOI
10.1007/s11661-015-2743-5
ISSN
1073-5623
Article Type
ARTICLE
Files in This Item:

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Views & Downloads

Browse