Fundamental Aspects of Structural Alloy Design by P. Haasen (auth.), Robert I. Jaffee, Benjamin A. Wilcox

By P. Haasen (auth.), Robert I. Jaffee, Benjamin A. Wilcox (eds.)

FUNDAMENTAL features OF STRUCTURAL ALLOY layout is the court cases of the 10th Battelle Colloquium within the fabrics Sciences, held in Seattle, Washington, and Harrison scorching Springs, B.C., September 15-19, 1975. The subject of the convention was once the rising technology of alloy layout. even though the relationships of houses of alloys to their composition and constitution have lengthy been a dominant topic in actual metallurgy, it is just lately that metallurgists have grew to become their awareness from the analytical, put up hoc learn of the structure-property dating to the synthesis technique of alloy layout. As ordinary within the Battelle colloquia, the 1st day begun with a bunch of introductory lectures offered by way of leaders within the box, each one emphasizing his own method of the matter. This supplied a old standpoint for the colloquium. those papers, including the ceremonial dinner deal with of Professor J. R. Low, Jr., who used to be venerated on the colloquium, include the introductory portion of those court cases. Alloy layout is usually particular to a given software. hence, the desires in alloy layout in a few vital functions, fuel generators, electrical-power-generation gear, airframes, strain vessels, and nuclear functions have been provided in a gaggle of papers. An schedule discus­ sion on "Needs in Alloy layout" undefined. those papers provide the exterior constraints on alloy layout functions, and standards for mechanical, actual, and chemical homes for which the alloys has to be designed.

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Commonly, stress and temperature are the independent variables, and it makes sense to use these as the axes of the plot (as in Fig. I); but any pair can be used, the third then being displayed as a set of contours on the map (examples are shown in Section 4). 30 H. J. FROST AND M. F. ASHBY Structures are commonly subjected to multiaxial stress states. We have used an equivalent shear stress (1) and an equivalent shear strain rate (2) where 01, 02, and 03 are the principal strains and fl' f2' and f3 are the principal strain rates.

II. Ahearn, J. , 8, 387 (1974). 12. Basinski, Z. , Foxall, R. , 6, 807 (1972). 13. , J. Phys. Soc. Japan, 27, 929 (1969). 14. , Nachr. Akad. Wiss. 6 (1971); Rate Processes in Plastic Deformation of Materials, ASM, Metals Park, Ohio (1975), p. 47. 15. , 21, 753 (1973). 16. , Solid State Physics, Vol. 22, F. ), Academic Press, New York (1968), p. 27. 17. , Mat. Sci. , 4, 155 (1969). 18. U1itchny, M. , J. Less-Common Metals, 33, 105 (1973). 19. Sethi, V. , 9,527 (1975). 20. , Trans. Jap. Inst. , 15,435 (1974); 16, 17 (1975).

F) Construction of the Diagrams. The problem of the superposition of flow mechanisms is discussed elsewhere. 2,3,7 We have combined the rate equations discussed above to give the net strain rate: y = y] + [greatest of Y4 (and least of Y2 and Y3)] + Ys (14) where Y4 and Ys each describe the sum of two additive mechanisms. A mechanism is dominant if it contributes more to y than does any other mechanism. A field boundary is then defined as the set of values of Us and T at which a change of dominant mechanism occurs.

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