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The variation in the subgrain size in aluminum deformed to large steady-state creep strains

Paul P. Mieszczanski

The variation in the subgrain size in aluminum deformed to large steady-state creep strains

by Paul P. Mieszczanski

  • 399 Want to read
  • 33 Currently reading

Published .
Written in English

    Subjects:
  • Mechanical engineering

  • The Physical Object
    Pagination50 p.
    Number of Pages50
    ID Numbers
    Open LibraryOL25502358M

    occurs. Then the specimen strains gradually, at a decreasing creep rate during the primary stage of creep (B). The creep rate then becomes essentially constant for a period of time during the secondary or steady-state stage of creep (C). The slope of the creep curve in this second stage (which is also referred to as minimum-creep rate) is the rateFile Size: KB.   The variation in the steady-state creep-rate with the applied stress is often described by the steady-state stress exponent, n, 28 Microstructural Observations 28 Subgrain Size, Frank Network Dislocation Density, Subgrain Misorientation Angle, and the Dislocation Separation within the Subgrain Walls in Steady-State Structures 28 2 Pages:

    Creep: time dependent plastic deformation of metals subjected to a constant load or stress and at temperature greater than T_m. Typical Creep curve (strain vs Time) normally exhibits three distinct regions: transient (or primary), steady state (or secondary) and tertiary. Temperature and Applied Stress influence creep behavior Phase. Determination of Size and Strain. The previous section explained how size and inhomogeneous strain can broaden the powder diffraction peak. A question that has occupied the minds of many powder diffractionists during the last (20th) century is whether the mean size and strain within a powder can be calculated from the diffraction pattern even when both are present simultaneously.

    In the initial stage, or primary creep, or transient creep, the strain rate is relatively high, but decreases with increasing time and strain due to a process analogous to work hardening at lower temperatures. For instance, the dislocation density increases and, in many materials, a dislocation subgrain structure is formed and the cell size decreases with strain. Influence of grain size, solute atoms and second-phase particles on creep behavior of polycrystalline solids Oleg D. Sherby a,*, Eric M. Taleff b a Department of Materials Science and Engineering, Stanford Uni ersity, Stanford, CA , USA b Department of Mechanical Engineering, The Uni ersity of Texas at Austin, Texas Materials Institute.


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The variation in the subgrain size in aluminum deformed to large steady-state creep strains by Paul P. Mieszczanski Download PDF EPUB FB2

Ad-ar the variation in the subgrain size in aluminum deformed 1/1 to large steady-state creep strains(u) naval postgraduate school monterey ca p p mieszczanski m unclassified mem sep 85 mlmsilll f/g 11/6 m ileleellllleeee mllllmlllllll lliiiiiiiiei.

The variation in the subgrain size in aluminum deformed to large steady-state creep strains. Aluminum specimens were deformed to various large steady-state strains and examined by transmission electron microscopy to determine the average subgrain size. It was found that the subgrain size was constant over a very wide (e = 16) range of steady-state strain.

The variation in the subgrain size in aluminum deformed to large steady-state creep : Paul P. Mieszczanski. Theobserveddependenceofthesteady-state subgrainsizeonthesteady-statestress. Thedataofthepresentinvestigationis alsoindicated 31 HighpurityaluminumTEMmicrographstaken specimensdeformedtostrainsofand edsubgrainsareobserved the variation of the dislocation density in aluminum deformed to large steady-state creep strains 12 personal author(s) ",wtter.

timothy scott 13a type of report 13b time covered 14date of report (~hoy pace count zasterls thesis from to march 56 '6 supplementary notation 17 cosati codes Author: Timothy Scott Wetter. M.E. Kassner and M.E. McMahon, “The Variation of the Subgrain Misorientation in Aluminum Deformed to Large Steady-State Creep Strains,” Creep and Fracture of Engineering Materials and Structure, B.

Wilshire and R.W. Evans, eds., Institute of Metals, London,pp. The variation in subgrain size as a function of time following stress reductions is shown in Fig. These data clearly show that the subgrain size increases after a stress reduction approaching the subgrain size which would be obtained during steady state deformation at by: Variations in the (a) local creep rate and (b) subgrain size for coarse and fine subgrains during primary and secondary stages of class M creep of copper single crystals (Hasegawa et al., ).

(Reprinted from S. Takeuchi and A. Argon, J. Mater. For instance, at a stress of MPa, one expects where the steady-state subgrain size approaches the speci- a subgrain size of mm (⫽ 23 bG /, b, and G from Refer. An approximate theoretical relation is derived which relates stress during steady state creep to both subgrain size and dynamically recrystallized grain size.

The relation results from equating the dislocation strain energy in the grain boundary to that in the enclosed by: The cell or subgrain size is generally found to be independent of strain at strains larger than (e.g.

Duly et al. ), and as shown in figure a, although it depends on the temperature and rate of deformation (§). However, the subgrain misorientations increase with strain as shown in figure b.

In Figures 6(a) and (b), the variations of the subgrain size d and the mesh size s in creep-deformed Al wt pctZn alloy are shown. Even after the so-called steady state has been attained, defined by constancy of the subgrain size d beyond a strain of about (marked by the red bold broken vertical line in the figure), the dislocation Author: Haël Mughrabi.

The subgrain size δ in the deformed material can be calculated out of the dislocation densities. in general the steady state is reached before than in the experimental data.

G.R.; Cook, W.H. A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures. In Proceedings of the 7th Cited by: 3. The steady-state dislocation structure that develops during creep is a subgrain structure.

The characteristic dislocation spacings are mainly determined by : Wolfgang Blum. grain diameter on the steady state creep rate of some alloys has been investigated [7,8]. The steady state creep rate was found to decrease with increasing the grain size and was related to it by a Petch style relation.

Because of the industrial important applications of Sn-1wt%Zn alloy [1,2]. The first steps in the process are carried out well above the recrystallization temperature to take advantage of the lower strength of the metal.

the last step is performed just above the recrystallization temperature, using a large percent deformation in order to produce the finest possible grain size. We find a steady-state creep rate of less than 10 −6 per second—six to eight orders of magnitude lower than most nanocrystalline metals—at various temperatures between and times the Cited by: With the decrease in the particle size and spacing between particles, recrystallization kinetics is retarded, but final grain size becomes quite large [37, 40].

Several researchers have studied the relationship between dispersion characteristics, deformation substructure, and recrystallization [ Cited by: 4. Micrograin Superplasticity refers to the ability of fine-grained materials (1 µm size) to exhibit extensive neck-free elongations during deformation at elevated temperatures.

Over the past three decades, good progress has been made in rationalizing this phenomenon. The present paper provides a brief review on this progress in several areas that Cited by:.

From the contents: Macroscopic characteristics of strain at high temperatures - Experimental equipment and technique of in situ X-ray investigations - Experimental data and structural parameters in deformed metals - Subboundaries as dislocation sources and obstacles - The physical mechanism of creep and the quantitative structural model.

Strength of Metals and Alloys, Volume 1 covers the proceedings of the Seventh International Conference on the Strength of Metals and Alloys.

The book presents papers that discuss the properties of various metals and alloys. The text contains studies, which are grouped into six Edition: 1.The variation of subgrain misorientation in aluminum deformed to large steady-state creep strains Conference Kassner, M.E.

; McMahon, M.E. Pure aluminum was deformed in torsion of /sup 0/K to various steady-state strains up to