Plastic deformation and dislocation arrangement of Nb-34 at.% Ta alloy single crystals

Abstract Nb66 Ta34 alloy single crystals having orientations in the central part of the stereographic triangle and an interstitial impurity content of less than 10p.p.m. (C + N + O) have been deformed in tension at 77, 195, 295, 330 or 470 K. The dislocation behaviour and arrangement have been studied by slip-line observations, Laue X-ray back-reflection, X-ray topography and transmission electron microscopy (TEM). The slip-line investigations indicate that at each deformation temperature the plane that carries the maximum resolved shear stress (MRSS) is the active macroscopic slip plane. At low deformation temperatures (i.e. 77 and 195 K) the work-hardening curves are parabolic and the dislocation arrangement consists of primary and secondary screw dislocations and of tangles of non-screw dislocations. At intermediate temperatures (i.e. 295, 330 and 470 K) the work-hardening curves resemble that of f.c.c. crystals with an extended stage I. However, the experimental findings suggest that a gradual transit...

[1]  V. Novák,et al.  Optical investigation of anomalous slip-line patterns in high purity niobium and tantalum single crystals after tensile deformation at 77 K , 1985 .

[2]  W. Wasserbäch.  Anomalous slip in high-purity tantalum single crystals after tensile deformation at 77 K , 1985 .

[3]  W. Wasserbäch.  Phonon‐Dislocation Scattering and Low‐Temperature Lattice Thermal Conductivity of Niobium and Tantalum Single Crystals Deformed at Low Temperatures , 1985 .

[4]  B. Šesták,et al.  Development of the dislocation arrangement in Fe-0·9 wt% Si single crystals deformed in tension , 1983 .

[5]  H. Mughrabi,et al.  Annihilation of dislocations during tensile and cyclic deformation and limits of dislocation densities , 1979 .

[6]  W. Wasserbäh.  Low-temperature thermal conductivity of plastically deformed niobium single crystals , 1978 .

[7]  D. K. Bowen,et al.  The deformation behaviour of dilute niobium-nitrogen alloys , 1977 .

[8]  B. Mordike.  Athermal solid solution hardening in niobium alloy single crystals , 1976 .

[9]  V. Novák,et al.  Work-hardening of Fe, Fe-0·5 wt% Si and Fe-0·9 wt% Si single crystals , 1976 .

[10]  U. Essmann,et al.  Slip in copper crystals following weak neutron bombardment , 1973 .

[11]  G. Taylor,et al.  Anomalous slip in high-purity niobium single crystals deformed at 77°K in tension , 1972 .

[12]  A. Seeger,et al.  The Relationship between the Work‐Hardening of B.C.C. and F.C.C. Metals , 1971 .

[13]  R. A. Foxall,et al.  Dislocation arrangements in deformed single crystals of niobium-molybdenum alloys and niobium-9 at.% rhenium , 1970 .

[14]  H. Schultz,et al.  Inherent lattice hardening and interstitial solution hardening in tantalum , 1970 .

[15]  W. Frank,et al.  A unified model for the interpretation of the low-temperature yield stress, its dependence on crystal orientation, and of the slip geometry of BCC metals , 1970 .

[16]  A. Luft.  The correlation between dislocation structure and work-hardening behaviour of molybdenum single crystals deformed at 293° K , 1970 .

[17]  R. Labusch.  A Statistical Theory of Solid Solution Hardening , 1970 .

[18]  A. Hendrickson,et al.  Solid solution strengthening in Nb-Ta and Nb-Mo alloy single crystals , 1970 .

[19]  M. Duesbery,et al.  A detailed study of the deformation of high purity niobium single crystals , 1969 .

[20]  E. Furubayashi.  Behavior of Dislocations in Fe-3% Si under Stress , 1969 .

[21]  M. Duesbery,et al.  Defects in Body Centred Cubic Metals and Alloys. , 1969 .

[22]  U. Daybelge.  Unified Transport Theory of Two-Temperature Fully Ionized Plasmas , 1969 .

[23]  H. Mughrabi.  Electron microscope observations on the dislocation arrangement in deformed copper single crystals in the stress-applied state , 1968 .

[24]  V. Sládek,et al.  Slip Planes in fe - 3% si Single Crystals Deformed at 77 °K , 1967 .

[25]  A. Keh,et al.  PLASTICITY OF IRON SINGLE CRYSTALS , 1967 .

[26]  M. Wilkens.  APPLICATION OF X-RAY TOPOGRAPHY TO THE ANALYSIS OF THE DISLOCATION ARRANGEMENT IN DEFORMED COPPER SINGLE CRYSTALS , 1967 .

[27]  J. Christian,et al.  Experiments on the deformation of niobium single crystals. I. Stress versus strain curves and slip systems in compression and tension , 1967 .

[28]  R. Arsenault,et al.  Work hardening and dislocation structure in Ta and Ta-base alloys , 1967 .

[29]  M. Duesbery,et al.  THE DEFORMATION OF NIOBIUM SINGLE CRYSTALS , 1967 .

[30]  D. K. Bowen,et al.  DEFORMATION PROPERTIES OF NIOBIUM SINGLE CRYSTALS , 1967 .

[31]  P. L. Pratt,et al.  The Effect of Orientation on the Yielding and Flow of Molybdenum Single Crystals , 1966, 1966.

[32]  W. Spitzig,et al.  Dislocation arrangements in tantalum single crystals deformed in tension at 373°K , 1966 .

[33]  M. Duesbery,et al.  THE PLASTICITY OF PURE NIOBIUM SINGLE CRYSTALS , 1966 .

[34]  J. Steeds.  Dislocation arrangement in copper single crystals as a function of strain , 1966, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[35]  U. Essmann.  Elektronenmikroskopische Untersuchung der Versetzungsanordnung verformter Kupferein kristalle III. Bestimmung der Versetzungsdichte , 1966 .

[36]  W. Spitzig,et al.  Three-stage hardening in tantalum single crystals. , 1965 .

[37]  J. Christian,et al.  THE EFFECT OF HIGH VACUUM PURIFICATION ON THE MECHANICAL PROPERTIES OF NIOBIUM SINGLE CRYSTALS , 1965 .

[38]  A. Keh.  Work hardening and deformation sub-structure in iron single crystals deformed in tension at 298°k , 1965 .

[39]  U. Essmann.  Elektronenmikroskopische Untersuchung der Versetzungsanordnung verformter Kupfereinkristalle II. Die Versetzungsanordnung im Bereich II , 1965 .

[40]  T. Mitchell,et al.  The detection of secondary slip during the deformation of copper and α-brass single crystals , 1964 .

[41]  P. Hirsch.  A theory of linear strain hardening in crystals , 1964 .

[42]  R. M. Broudy,et al.  Dislocations and Mechanical Properties of Crystals. , 1958 .

[43]  S. Mader.  Elektronenmikroskopische Untersuchung der Gleitlinienbildung auf Kupfereinkristallen , 1957 .