Transformation during Heat Treatment of Alloys of the Ti-Mo System with Aluminum, Zirconium and Tin Additives,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The introduction of aluminum to an alloy with 5.5 Mo considerably increases its strength in the quenched state zirconium has virtually no effect on hardness, but tin softens this alloy. The introduction of aluminum, zirconium or tin to the beta-alloys with 11 and 15 Mo increases strength in the quenched state, but the zirconium or the tin must be introduced in approximately twice the amount as aluminum in order to obtain the same degree of hardening. The introduction of Al, Zr, Sn to alloys with beta-structure 11 and 15 Mo suppresses the formation of the omega-phase, and the region of its formation is narrowed and shifts to lower aging temperatures. The data show the advisability of using neutral hardeners of tin and zirconium in place of or in addition to aluminum during alloying. Zirconium in beta-alloys is especially useful. The alloys with zirconium possess higher plasticity after heat treatment than alloys with aluminum or tin.
- Properties of Metals and Alloys