報告書番号

T01014

タイトル（和文）

Ti-Ni-Cu形状記憶合金の機能および疲労特性に及ぼす加工・記憶熱処理効果 -Effect of Cold Working and Shape Memory Treatment on Cyclic Behavior and Fatigue Properties in Ti-Ni-Cu Shape Memory Alloy Wires under Thermo-Mechanical Cyclic Conditions-

タイトル（英文）

概要 （図表や脚注は「報告書全文」に掲載しております）

Ti-Ni系形状記憶合金は繰り返し特性や耐食性等に優れているため，様々な分野へ応用されている．形状記憶合金を用いた機器の設計を行う場合には，繰り返しに伴う機能特性の変化が最も重要である．本報では，Ti-41.7Ni-8.5Cu(at%)形状記憶合金を対象に，種々のひずみおよび加熱条件のもとに熱･力学サイクル試験を行い，繰り返し変形挙動に及ぼす加熱温度，冷間加工率および形状記憶処理温度の影響について調べた．その結果，回復ひずみや回復ひずみエネルギーの減少に起因する機能劣化は，高加工率および高加熱温度ほど増大することが明らかとなった．また，記憶処理温度については，処理温度を高くするほど冷間加工の影響を緩和する効果があり，機能劣化は処理温度の上昇に伴い低減することが明らかとなった．

概要 （英文）

Ti-Ni base shape memory alloy has been used for many applications because it has superior characteristics of cyclic behavior, corrosion resistance and so on. Degradation of functions in shape memory alloys is an important consideration in their design. In this paper, thermo-mechanical cycle tests are conducted under different strains and heating temperatures for Ti-41.7Ni-8.5Cu(at%) shape memory alloy wires, which have different cold working ratios and shape memory treatment temperatures. The effects of heating temperature, cold working ratio and shape memory treatment temperature on the functional degradation are discussed. Results show that the degradation due to decrease in the recovery strain and the recovery strain energy increases with increasing cold working ratio and heating temperature. It is also clarified that the higher shape memory treatment temperature is more effective for decreasing the effects of cold working, and that the degradation decreases with increasing shape memory treatment temperature.

報告者

キーワード