• PDF / 79,668 Bytes
• 1 Pages / 597.6 x 777.6 pts Page_size
• 84 Downloads / 267 Views

DOWNLOAD

REPORT

---

free eutectic thin-films (~200A) thick were produced at GECR&D using evaporated layers on glass slides and laser heat sources. An exciting novel technique to produce in situ composites by mechanical means from cast dendritic structures was described by Verhoeven and Bevk. Research under these professors at Iowa State and Harvard University produced Cu-Nb+Sn filamentary composites by wire drawing techniques with varying volume fractions which had outstanding superconducting properties. In composites with the smallest filaments (d~50-200A) and filament densities as high as \0l0/cm2, the dislocation density in the matrix reaches values of 1013cm/cm3. The yield stress of these samples increases dramatically over the predictions

based on the "rule of mixtures" and their ultimate tensile strength approaches the estimated theoretical strength of the material (~2.7GPa). Discussions on the chocolatevanilla phase diagram (below) continued over lunch and dinner with variations in bubble diagrams in beer. Malcolm McLean National Physical Laboratory England F. D. Lemkey United Technologies Research Center H. E. Cline General Electric Research and Development Chairmen

The Chocolate-Vanilla Phase Diagram 570

A/anilla malt \ and chocolate (vanilla) a

a> a

hocolate Malt and chocolate

Chocolate ripple

E Solvus line 10 15 20 25 Percentage chocolate

PAGE 6 — MRS BULLETIN, JANUARY/FEBRUARY 1982

30

40