title: Effects of microstructure and deformation conditions on the hot formability of Ni-Ti-Hf shape memory alloys.
abstract: Ingots of Ni-Ti-Hf shape memory alloys were prepared by vacuum arc re-melting. Isothermal hot compression tests were conducted at temperatures ranging from 700 to 1000 degrees C and at strain rates from 10(-2) s(-1) to 1.0 s(-1). A decrease in the Ni content below 50.2 at.% significantly deteriorated the hot workability due to the formation of a brittle second phase. Also, the low Ni content alloy showed poor workability when the temperature exceeded 900 degrees C. Additional compression tests were conducted under various conditions to clarify the effects of the chemical composition, solidification anisotropy, and the strain rate.
authors.forename: Jeoung Han
authors.initials: JH
authors.lastname: Kim
authors.forename: Chan Hee
authors.initials: CH
authors.lastname: Park
authors.forename: Seong Woong
authors.initials: SW
authors.lastname: Kim
authors.forename: Jae Keun
authors.initials: JK
authors.lastname: Hong
authors.forename: Chang-Seok
authors.initials: CS
authors.lastname: Oh
authors.forename: Yeong Min
authors.initials: YM
authors.lastname: Jeon
authors.forename: Kyong Min
authors.initials: KM
authors.lastname: Kim
authors.forename: Jong Taek
authors.initials: JT
authors.lastname: Yeom