Effect of low temperatures on the mechanical properties of a commercially pure titanium

Notch~d a nd unnotch e~ teJ.lsile speci mens of annealed commercially pure titanium were slowly stramed to fract ure m smgle-stage tests at -196 to + 100 C. Unnotched tensile sp ecill1 e~s a lso wer e strained in t wo-stage test~ (strained at one temperature unt il just after the maXlmu m load w!1s reacl;ed and t hen stra.llled to fracture at a different temperat ure) to r eveal t he effect of pnor-stram-temper at ure history on t he tensile proper ties of t he titanium . Impact tests were made on Charpy V-notch specimens at -U)6 to + 200 C for a determination of t he impact notch-toughness of the metal. T rue-stress-true-strain relations were determined for t~e t.itan. ium in tension, and a stu d y was r;l ade of the effects of test temperature and the stress cl1strlbutlOn on the rates of work-hardenmg of t he metal. 'r denotes trace (0.0001 to 0.001%). 0 , 4 1' be spectrograpbic method used was not sensitive enough lor determ ination 01 tungsten.