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Title:Experimental study of mechanisms of brittle-to-ductile transition of cleavage fracture in silicon single crystals
Author(s):Hsia, K. Jimmy; Argon, Ali S.
Subject(s):Brittle-to-ductile Transition
Cleavage Fracture
Silicon Single Crystals
Abstract:The micromechanisms of brittle-to-ductile transition (BDT) of cleavage fracture in Si single crystals have been investigated using a recently developed novel experimental technique. The crack arrest tests were performed by propagating a cleavage crack with a quasi-steady state velocity against a temperature gradient. Constant K specimens with cracks on {111} and {110} cleavage planes were used. A laser imaging technique was used to measure the crack velocity. The crack arrest temperature (BDT temperature) was determined as a function of crack velocity. An etch-pitting technique was used to study the dislocation structure at or near the crack arrest front. The results indicate that high dislocation mobility and a high dislocation density are needed to arrest a running cleavage crack. Preliminary evidence has confirmed that for Si crystals, the rate-limiting mechanism for the BDT is dislocation motion rather than dislocation nucleation.
Issue Date:1993-07
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 718
Genre:Technical Report
Sponsor:Energy Department 93/07; National Science Foundation 93/07
Rights Information:Copyright 1993 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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