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LAR-9 High-temperature X-ray diffraction experiments have provided confirming evidence regarding the origin of the metastable gamma phase and of the general features of the zirconium-hydrogen phase system a s presented in LAR-8. These experiments a l so showed that the reaction alpha t delta -. beta (the eutectoid reaction on heating) proceeds at an extraordinar i ly slow ra t e , although the r e v e r s e reaction proceeds so rapidly that beta phase cannot be retained to room tempera ture by quenching,, The sluggishness of the eutectoid reaction on heating has undoubtedly resul ted in erroneous int e r p r e tation of cer ta in physic a1 and mechanical proper t ies determined previously in this and other investigations a Determination of the mechanical propert ies of zirconium hydride containing various minor alloy additions is continuing. data a r e still quite sketchy, alloy additions of 5 a/o Sc o r 2. 2 a/o Cu show the most promise at this time. Although these .. . . ; . 14 0 !, 1 . . . I .. . . . UNIVERSITY OF DENVER

REACTOR MATERIALS STUDY. RESEARCH AND DEVELOPMENT OF METAL HYDRIDES. Quarterly Report No. 7 for April 1, 1960 to June 30, 1960