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Anomalous temperature dependence of the yield stress by {1122}〈1123〉secondary pyramidal slip in cadmium crystals—II. Mechanism

Tonda, Hideki and Ando, Shinji and Takashima, Kazuki and Vreeland, Thad, Jr. (1994) Anomalous temperature dependence of the yield stress by {1122}〈1123〉secondary pyramidal slip in cadmium crystals—II. Mechanism. Acta Metallurgica et Materialia, 42 (8). pp. 2853-2858. ISSN 0956-7151. https://resolver.caltech.edu/CaltechAUTHORS:20150310-132124846

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Abstract

The yield stress due to {1122}〈1123〉second order pyramidal slip in cadmium crystal increases with increasing temperature. The mechanism of this anomalous temperature dependence is proposed on the basis of experimental results shown in our previous paper. A (c + a) edge dislocation is dissociated into a c sessile dislocation and an a basal one by thermally activated process, and the (c + a) edge dislocation is immobilzed as a result. The immobilization causes the mean free path of the edge dislocations and the strain in slip bands to decrease with increasing temperature. Consequently, double cross slip of (c + a) screw dislocations must be activated thermally by a increment of applied stress to increase propagation velocity of slip band width. Since each of the mean free paths and the strain slip bands is nearly constant independent of strain and strain rate, the increasing of propagating velocity with increasing strain rate is achieved also by an increment of applied stress.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0956-7151(94)90226-7 DOIArticle
http://www.sciencedirect.com/science/article/pii/0956715194902267PublisherArticle
Additional Information:© 1993 Elsevier Science Ltd. Received 29 September 1993.
Issue or Number:8
Record Number:CaltechAUTHORS:20150310-132124846
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150310-132124846
Official Citation:Hideki Tonda, Shinji Ando, Kazuki Takashima, Thad Vreeland Jr., Anomalous temperature dependence of the yield stress by {1122}〈1123〉 secondary pyramidal slip in cadmium crystals—II. Mechanism, Acta Metallurgica et Materialia, Volume 42, Issue 8, August 1994, Pages 2853-2858, ISSN 0956-7151, http://dx.doi.org/10.1016/0956-7151(94)90226-7. (http://www.sciencedirect.com/science/article/pii/0956715194902267)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55676
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Mar 2015 21:06
Last Modified:03 Oct 2019 08:07

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