THE LATTICE PARAMETERS OF TITANIUM AT CRYOGENIC TEMPERATURES.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The lattice parameters of high purity electrolytic titanium less than 75 BHN, commercially pure titanium, and Ti-4Al alloy were measured over a temperature range from 4.2 K to 300 K using x-ray diffraction techniques. Both the a and c lattice parameters were found to decrease uniformly from 300 K down to 100 K. From 100 K to 4.2 K the a parameter continues to decrease at a reduced rate and the c parameter remains constant. The development of a technique for the accurate and rapid determination of changes in lattice parameters with temperature was a special goal of this study and a simplified method of computing lattice parameters is presented. Author