Materials Research for Advanced Inertial Instrumentation. Task 1. Dimensional Stability of Gyroscope Structural Materials.
Research rept. 1 Oct 81-30 Sep 82,
CHARLES STARK DRAPER LAB INC CAMBRIDGE MA
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Microstructure evaluations of HIP50 and X-520 experimentally produced grades of Be materials were continued during this reporting period. These materials were examined by transmission as well as scanning transmission electron microscopy TEMSTEM techniques. Gentle procedures were developed for producing appropriate samples for this purpose. Work performed during this recent study was substantially more extensive than efforts made previously and included a determination of second phase particle size, number density, elemental composition and their distribution in the material. Several notable difference were observed between the two beryllium grades and these appeared to explain the differences in the microyield strength MYS property behavior that was determined and reported upon in prior annual reports. A substantial amount of effort was expended on the construction of the 10 to the -7th power inchinch tensile microcreep measuring facility that was designed and discussed earlier. An oven capable of controlling sample temperature within 0.02 degrees F was constructed and tested. The load train and novel design thin film capacitive extensometer were also built. Preliminary evaluations of these components and all support electronics were made and determined to be quite satisfactory.
- Laminates and Composite Materials
- Properties of Metals and Alloys