PREYIELD PLASTIC DEFORMATION IN COPPER POLYCRYSTALS

被引:18
作者
VELLAIKAL, G
WASHBURN, J
机构
[1] Inorganic Materials Research Division, College of Engineering, University of California, Berkeley
关键词
D O I
10.1063/1.1657973
中图分类号
O59 [应用物理学];
学科分类号
摘要
Preyield dislocation motion and multiplication were studied in large-grained polycrystalline OFHC copper by the etch-pit technique. Specimens were loaded in compression and dislocation arrangements were observed in both the stressed and unstressed conditions. The dislocation loops generated by the first few active sources on both primary and secondary slip systems generally traversed the entire cross section of the grain. The observations were consistent with the idea that jog density is an important factor in determining the mobility of a dislocation segment. The external surface was found to be a preferential site for dislocation multiplication even when grown in segments, where they cut the surface, were immobile, and stress concentrations were carefully avoided. It is suggested that the rapid increase in length per unit volume of moving dislocation line that is associated with macroscopic yield requires motion of dislocation segments of high jog density. © 1969 The American Institute of Physics.
引用
收藏
页码:2280 / +
页数:1
相关论文
共 13 条
[1]   DISLOCATION ARRANGEMENT IN COLDWORKED POLYCRISTALLINE COPPER RODS [J].
ESSMANN, U ;
RAPP, M ;
WILKENS, M .
ACTA METALLURGICA, 1968, 16 (10) :1275-&
[2]  
FISHER JC, 1952, T AM I MIN MET ENG, V194, P531
[3]   ETCH PITS AT DISLOCATIONS IN COPPER [J].
LIVINGSTON, JD .
JOURNAL OF APPLIED PHYSICS, 1960, 31 (06) :1071-1076
[4]   DISLOCATION MOTION IN COPPER SINGLE CRYSTALS [J].
MARUKAWA, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1967, 22 (02) :499-&
[5]   INFLUENCE OF JOG CONCENTRATION ON CONSERVATIVE MOTION OF DISLOCATIONS IN COPPER [J].
PETROFF, P ;
WASHBURN, J .
JOURNAL OF APPLIED PHYSICS, 1966, 37 (13) :4987-&
[6]   INITIATION OF PLASTIC FLOW IN COPPER [J].
TINDER, RF ;
WASHBURN, J .
ACTA METALLURGICA, 1964, 12 (02) :129-&
[7]  
VELLAIKAL G, 1968, THESIS U CALIFORNIA
[8]   STUDY OF DISLOCATIONS IN LIGHTLY DEFORMED COPPER CRYSTALS USING BORRMANN X-RAY TOPOGRAPHY [J].
YOUNG, FW ;
SHERRILL, FA .
CANADIAN JOURNAL OF PHYSICS, 1967, 45 (2P2) :757-&
[9]   YIELD STRESS OF COPPER CRYSTALS [J].
YOUNG, FW .
JOURNAL OF APPLIED PHYSICS, 1962, 33 (03) :963-&