발간논문
Home > KJMM 논문 > 발간논문

Vol.38, No.11, 1432 ~ 1439, 2000

Title

Characteristics of the Intermetallic Compound Co3AlCx ( k - phase ) in Co-Al-C System Part 3 : Dislocations in Deformed ( Co ) + k Two Phase Alloy

명태호Tai Ho Myeong , Yoshinao Mishima , 황금연Keum Yeon Hwang , 강창석Chang Sug Kang

Abstract

Using a method based on thickness extinction contour under week-beam condition in combination with g·b = 0 invisibility criterion the Burgers vector of slip dislocations of κ-phase in Co-Al-C system after deformation is determined. Results show that predominant slip dislocations are on {111} planes with a Burgers vector of $lt;110$gt; type. However, non-conservative $lt;110$gt; dislocations on the same {111} slip plane are also found. Dissociation of superlattice dislocations and further sub-dissociation of superpartials are observed. In α-Co alloy containing fine coherent κ-phase precipitates, deformation proceeds by cooperative movement of {a/6}$lt;211$gt; Schokley partial dislocations cutting through κ-phase particles, leaving behind a band of highly disordered region, which probably responsible for the low ductility of this alloy. The easy movement of dislocations in κ-phase and absence of localized deformation in α-Co matrix are believed to account for the relatively higher ductility of alloy consisting a large amount of κ-phase.

Key Words

| PDF

발간논문Home > KJMM 논문 > 발간논문

발간논문
Home > KJMM 논문 > 발간논문