In 2003, a group of metastableβ-type titanium alloys basically expressed as Ti3(Ta+Nb+V) + (Zr、Hf) + O were developed by Saito et. al.. These alloys were called as multifunctional alloys due to their many“super”properties, such as super elasticity, super plasticity, and Invar and Elinvar properties. Particularly, these are the alloys that combine the ultralow elastic modulus and ultrahigh strength, which breaks the norm that a metal can not have both simultaneously. Therefore, they can be expected to...
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