Recrystallization behavior

Alloy designation Composition (wt%) Temperature for 100% recrystallized structure (f = 1 h) (°C) Typical ultimate tensile strength at 1000 °C (MPa) 

Experiments with various oxide-dispersion-strength-ened (ODS) Mo materials with 2vol.% of oxide, mean oxide particle sizes in the as-sintered state of around 0.8 xm, and a degree of deformation ln(Ao/A) = 8.5 (Ao = cross section as-sintered, A = cross section as-deformed), revealed differences in the recrystallization temperature of up to 750 °C depending on the oxide used. It could be shown that this effect is caused by particle refinement during deformation and subsequent heat treatment. Particles which increase the recrystallization temperature very effectively, as is the case with La203, show a high particle deformability [1.143]. 

The recrystallization temperature can be tailored by varying both the type and the content of the oxide, the lat- 

AKS-W shows a similar effect where the K-containing bubbles are effective pinning centers. The recovery and recrystallization mechanisms of AKS-W as a function the annealing temperature are summarized in Table 3.1-113. 

Molybdenum and Tungsten Alloys [1.133]. The formation of a cellular dislocation structure increases both strength and fracture toughness [1.146,147]. Additionally, the mechanical properties depend on the type of deformation process, purity, and heat treatment. The thermomechanical treatment (TMT) serves to obtain the specified shape, to eliminate the porosity, and to adjust the mechanical and structural properties. In particular. 

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Melting and recrystallization behavior of virgin PTEE has been studied by dsc (64). A quantitative relationship was found between and the heat of crystallization (A/T) in the molecular weight range of 5.2 x 10 to 4.5 X 1 0, where is heat of crystallization in J/g, which is independent of cooling... 

In one of the most significant observations, small amounts of recrystallized material were observed in rutile at shock pressure of 16 GPa and 500 °C. Earlier studies in which shock-modified rutile were annealed showed that recovery was preferred to recrystallization. Such recrystallization is characteristic of heavily deformed ceramics. There has been speculation that, as the dislocation density increases, amorphous materials would be produced by shock deformation. Apparently, the behavior actually observed is that of recrystallization there is no evidence in any of the work for the formation of amorphous materials due to shock modification. Similar recrystallization behavior has also been observed in shock-modified zirconia. 

The different recrystallization behavior as revealed by differential scanning calorimetry (DSC) complicates the understanding of structure formation as a dependence of take-up speed and seems to particularly correspond to the... 

Schoonmaker J.E. (1981) Magnesian calcite-seawater reactions solubility and recrystallization behavior. Ph.D. dissertation, Northwestern Univ., Evanston, IL. 

The stability of glass-forming systems is also a matter of considerable importance. Early studies have explored the association between the glassy behavior and the chemical stability (80), whereas a number of investigations have examined the recrystallization behavior of glassy drugs and excipients. In essence, the increased molecular mobility above the glass transition temperature renders recrystallization... 

FIGURE 4.14 The effect of modulation amplitude on the recrystallization behavior of linear polyethylene. (From Scherrenberg, R., Mathot, V., and Van Hemelrijck, A., Thermochim. Acta, 330, 3, 1999. With permission.)... 

Schoonmaker, J. E. (1981), Magnesian Calcite-Seawater Reactions Solubility and Recrystallization Behavior, Ph.D. Dissertation, Northwestern University, Evanston, IL. 

The initial recrystallization tests were also carried out in the sight glass this was to provide a facility for visual determination of recrystallization behavior. Recrystallization of materials is very complex irrespective of the process, be it with liquid antisolvents or with gas antisolvents. For example, the particle size and particle size distribution (PSD) that results during recrystallization is a function of the solute, the solvent, the concentration of solute in... 

O.M. Ivasishin, P.E. Markovsky, Y.V. Matviychuk, and S.L. Semiatin, Precipitation and Recrystallization Behavior of Beta Titanium Alloys During Continuous Heat Treatment, Metall. Mater. Trans. A, Vol 34, 2003, p 147-158... 

Cah] Tensile and hardness testing. Optieal mieroscopy and TEM studies Recrystallization behavior of deformed V(Fe22Co7g)3. 

Ina] Inagaki, H., Effect of C Concentration on the Recrystallization Behavior and the Reciystal-... 

Several authors (Leslie et al., 1961 Scheucher, 1969a,b Murphy and Ball, 1972 Hausmann, 1987) tried to explain this recrystallization behavior by the Avrami and Johnson-Mehl relation. This relation was originally derived by Avrami to explain the kinetics of diffusive phase transitions and later applied by Johnson and Mehl to recrystallization. Accordingly the quantity 1 — R, where R is normalized yield stress, should behave as a function of annealing time like the growth of the volume of a new phase as a function of time. The experimental curve can in fact be fitted by desired relation... 

Due to equilibrium constraints, polythermal methods typically do not reach the accuracy achievable with isothermal measurements, but provide first information about the general dissolution and recrystallization behavior of a substance. In addition, the identity of the soUd phase for which the solubiUty is measured cannot... 

The recrystallization behavior of the samples was confirmed by DSC. Figure 11 shows the DSC curves for samples A-C. Sample C shows the highestand no detectable recrystallyzation. Samples A and B display not only well-defined reciystallization peaks but also melting endotherms not observed in Sample C. From the results of the study, it was concluded that the DSC and DMA methods can be used for monitoring the cure levels in the silicone release coatings. 

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