Alfer /ˈælfər/ [al(yumini) and lat. Fer (rum)-iron]-magnetically soft iron-aluminum alloy (8.5% or 11.8-13.8% aluminum) with magnetostrictive properties (changes in size and shape when magnetized). 20-a. It was used in Japan in the 40s. It is used to prepare cores of magnetostrictive transducers in ultrasound and hydroacoustic equipment.
Ex. Due to its magnetostrictive properties, Alfer is indispensable in the creation of cores for magnetostrictive transducers, featuring widespread use in the realms of ultrasound and hydroacoustic equipment.