ABSTRACT

This paper gives data on the linear th ermal expansion of titanium (97.2 percent) at various temperatures between -190° and + 700° C. The coefficient of expansion of titanium increases from about 5 X 10-6 /° Cat -150° C to about 12 X 10-6/ 0 C at 650 0 C. The data on thermal expansion do not indicate the existence of polymorphic transformations of t itan ium between -190 0 and + 700 0 C.

Data ar e given on the li near t hermal expansion of aluminum and some a luminumberylliu.m, aluminl!m-copper, al~minum-sillc~m, al~J?inum-copper-iron , aluminum-coppermagneslUm, . alummum-col?per-lllckel, . alum In um-~llI con-copp er, al uminum-silicon-magneSIUm, a lummum-copper-mckel-magneslUm, a luilllnum-copper-t in-zillc aluminum-siliconcopper-mangan.ese, aly ill in ul!l-silicon -copper-nickel, alu min u m -s ilico n-dickel-cop per-manganese; and al u~lllum-slhcon.;-n--!ck~l-c opp er~Jl;lO lybdenum ~lloy s fo r various t emperature ranges be t"een -50 and + 400 IJ . Ihe add ItIOn of beryll lUm copper or silicon to aluminum cal1 se~ ~ decrease in the coeffic ients of expansion. Copper h~s a great er effect than bery llium, and SilICon J;tas. the greatest effect of thes.e . three allOYIng elements. T ernary diagrams are shown th.at llldlCate t he .effe cts .~f compOSitIOn on the coefficients of expansion of a luminl1m-copper-nICkel and a lummum-slhcon-copper alloys. Thc eff ects of additions o f t\yO o r three elem~nt s (c? ,?per, nickel, m::ng~ne se , ~nd molybdcnum) on th e coefficients of expansion of alummum-sll lCon alloys a re mdlCated III a fi gure.

D ata o n t he lin ear t hermal expa nsion of so m e ni ckel a ll oys (ma nganese ni ckel, H osk ins Alloy 667, In co nel, Evanohm, Monel metal, M-M-M all oy, IIIium all oy, and vVasp a ll oy) for van ous te mperatlll'e ra nges between 20° a nd 1,000° C are give n. Duri ng t he first heatin g of Inco nel all oys (l)roba bly wit h a s upersaturated co n ten t of ca r bon) , irreg ul a ri t ics we re noted m t he ex pansion at abo ut 700° C and were asc ribed to prec ipi tation of carbide. The coeffi cients of expa nSlO n of t he a ll oys are tabulated. F or t he ra nge 20° to 300° C these coC(fi cie nts vari ed fro m 13.1 to 1 5.5 X lO-6 per d eg C. The cffects o f a ddi t io ns of ~opp er , co balt, a nd 1ro n to Ill ckel-chromlUm a ll oys (0 to 24 perce nt of chro mium) a re indi cated .

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