Improvement of mechanical properties of Ti-based superelastic alloys through impurity alloying elements and controlling nano-scale modulated structure

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289247
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: University of Tsukuba
• Principal Investigator: KIM Hee Young 筑波大学, 数理物質系, 教授 (20333841)
• Co-Investigator(Renkei-kenkyūsha): MIYAZAKI Shuichi 筑波大学, 数理物質系, 特命教授 (50133038)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: チタン合金 / マルテンサイト変態 / 超弾性

Outline of Final Research Achievements

Mechanical properties of Ti alloys are strongly influenced by the interstitial alloying elements such as oxygen and nitrogen, which are unavoidable impurities in Ti alloys. In this study, the effects of interstitial alloying elements such as oxygen and nitrogen, on microstructure, mechanical properties and transformation and deformation behavior of meta-stable Ti alloys were investigated. The mechanism and origin of anomalous properties such as isothermal martensitic transformation under a constant stress, invar-like behavior and large nonlinear elastic strain with near zero hysteresis observed in Ti alloys containing a larger amount of interstitial alloying elements could be verified successfully.

Free Research Field

金属物性