Show New Metal Under Study One of the new exotic metals yttrium is drawing concentrated study from an Oregon State University metallurgical metallurgical metallurgical met met- engineer who is seeking ways to make the metal stronger and thereby increase it uses DR WILLIAM D. D McMullen is working with single crystals of yttrium at low temperatures temperatures temperatures tempera tempera- tures to 70 degrees F F. F believing that the key to great great- greater er strength lies in the basic structure of the metal Yttrium has not demonstrated ted the str strength theoretically it should have says McMullen apparently because of certain deformities s of crystals an and l the way they fit together certain crystal imperfections called dislocations lead to instability and slippage I IF THESE imperfections can be compensated for by alloy alloy- ing or by other special working working working work work- ing techniques the full potential potential potential po po- po- po of the metal can be realized he points out McMullen McMullen McMullen Mc Mc- Mullen earlier has worked with zirconium and some other of the exotic metals so call so-call called call call- ed because they're rare and expensive Yttrium now costs about per pound McMullen's work is supported support- support ed by a grant from the National Science Foundation tion A DEPARTMENT of Metallurgical Metallurgical Metallurgical Met Met- Engineering was formed in the School of Engineering this fall Research Research Research Re Re- search and teaching in the metals field earlier had been beena a part of the Department of Mechanical Engineering Mr McMullen is the son of Mr and Mrs T T. D. D McMullen 1922 South Davis Blvd ful |