ឡ⥲◊࣭◊✲ሗ࿌ 愛総研・研究報告 ➨ 16 号 2014 ྕ 2014 年 ᖺ 第 67 ⢊ᮎ෬㔠ረᛶຍᕤࡼࡿഴᩳᶵ⬟ᙧ≧グ᠈ྜ㔠ࡢస〇 Fabrication of Functionally-Graded Shape Memory Alloy ᯇ Ⰻ†㸪➉ࣀෆ Ⰻ㍜†† Ryosuke Matsui†, Ryosuke Takenouchi†† Abstract The martensitic and the reverse transformation temperatures are directly related to the bending rigidity of the TiNi shape memory alloy (SMA) wire. The present paper aimed to obtain the functionally graded wire in which bending rigidity varies along the wire axis, and a new fabrication process of combined powder metallurgy and plastic working was proposed. A multi-layered TiNi compact with various Ti/Ni compositions was obtained by pulse current pressure sintering (SPS) which was hot-extruded into a wire. The resulting wires were investigated on the transformation temperatures and deformation properties. The differential scanning calorimetry measurements showed that functionally graded properties of transformation temperatures retained in the wire. The wire had both shape memory effect and superelasticity. ࡇࡇ࡛ࡣ㸪Ni ⃰ᗘࡀ㍈᪉ྥἢࡗ࡚ኚࡍࡿ TiNi ↝⤖ 1㸬⥴ゝ యࣅࣞࢵࢺࢆ⇕㛫ᢲฟࡋᡂᙧࡋࡓ FG-TiNi SMA ࣡ࣖ ᙧ≧グ᠈ྜ㔠㸦Shape memory alloy㸪௨ୗ SMA㸧ࡣࡁ ࡘ࠸࡚㸪ኚែ ᗘ࠾ࡼࡧᛂຊࡢഴᩳᶵ⬟≉ᛶࢆホ౯ࡋ㸪෭ ࡞ኚᙧࡀຍ⇕ࡲࡓࡣ㝖Ⲵࡢࡳ࡛ඖࡢᙧ≧ࢆᅇࡍࡿ≉ᚩ 㛫ຍᕤࡼࡿኚែ≉ᛶࡢኚࢆሗ࿌ࡍࡿ㸬 ࢆᣢࡘ㸬ࡇࢀࡲ࡛ᵝࠎ࡞ྜ㔠⣔࡛ᙧ≧グ᠈ຠᯝࡢⓎ⌧ࡀ ぢฟࡉࢀ࡚࠸ࡿࡀ㸪ᐇ⏝ࡉࢀ࡚࠸ࡿྜ㔠⣔ࡣ TiNi ⣔ ࡛࠶ࡿ 1),2)㸬ࡋࡋ TiNi SMA ࠾࠸࡚ࡶᛂ⏝ࡣⓎᒎ㏵ୖ 2㸬FG-TiNi SMA ࣡ࣖࡢస〇ࣉࣟࢭࢫ ࠶ࡾ㸪ഴᩳᶵ⬟ TiNi SMA ࣡ࣖ㸦௨ୗ㸪FG-TiNi SMA ࣡ࣖ㸧ࡣ㸪་⒪⏝࢞ࢻ࣡ࣖࡸ⮬ᕫࢫࢺ࣮ࣟࢡไᚚᘧ FG-TiNi SMA ࣡ࣖࡢస〇᪉ἲࢆ Fig. 1 ♧ࡍ㸬TiNi ࢡࢳ࢚࣮ࣗࢱ㸪 ᗘࢭࣥࢧᶵ⬟ࢆഛ࠼ࡓ᪂ࡋ࠸ࢡࢳࣗ SMA ࣅࣞࢵࢺࡣཎᩱ⣲⢊ᮎࡋ࡚࢞ࢫࢺ࣐ࢬ Ti ⢊ᮎ ࢚࣮ࢱࡢᛂ⏝ࡀᮇᚅࡉࢀࡿ㸬࠼ࡤ་⒪⏝࢞ࢻ࣡ࣖ ࢝ࣝ࣎ࢽࣝ Ni ⢊ᮎࢆ⏝࠸ࡓ㸬TiNi SMA ࣅࣞࢵࢺࡢస〇 ࡢᛂ⏝ࡢࡓࡵࡣඛ➃ࡀ㌾ࡽࡃ㸪ᮎ➃ࡀ◳࠸ഴᩳᶵ⬟ ࡣ௨ୗࡢᡭ㡰࡛⾜ࡗࡓ㸬ࡲࡎ㸪Ti ⢊ᮎ Ni ⢊ᮎࡢΰྜ ࢆ᭷ࡍࡿࡇࡀせồࡉࢀࡿ㸬ࡑࡢࡓࡵ⌧≧࡛ࡣ㸪ࡑࢀࡒࢀ ྜࡣ㸪Ti-49.8at%Ni ࡽ Ti-51.0at%Ni ࡢ⠊ᅖ࡞ࡿࡼ࠺ ࡢ㒊ࡢせồ≉ᛶᛂࡌ࡚ᮦᩱࢆ㑅ᢥࡋ」㞧⤌ࡳྜࢃ タᐃࡋࡓ㸬㐟ᫍᆺ࣮࣑࣎ࣝࣝࡼࡿ TiNi ⢊ᮎࡢΰྜ᮲௳ ࡏ࡚〇㐀ࡉࢀ࡚࠸ࡿ㸬 ࡣ㸪ࢸ࣮ࣈࣝᅇ㌿ᩘ 200rpm㸪ΰྜ㛫 0.6ks ࡛࠶ࡗࡓ㸬స ୖグࡢ⌧≧ࢆ㋃ࡲ࠼㸪ᮏ◊✲࠾࠸࡚ࡣ㸪᭤ࡆ๛ᛶࡀ㛗 〇ࡋࡓΰྜ⢊ᮎࡣ㯮㖄ᆺෆ✚ᒙࡋ࡞ࡀࡽሸࡋࡓ㸬ࡇࡢ ᡭ᪉ྥᚎࠎኚࡍࡿ FG-TiNi SMA ࣡ࣖࢆࡑࡢ〇㐀 ࡁ㸪ୗࡽ Ni ⃰ᗘ 51.0at%㸪50.8at%ࡢ㡰 49.8at%ࡲ࡛ ᪉ἲేࡏ࡚⪃ࡋࡓ㸬ࡇࡢᮦᩱࡣ㸪ᮦᩱ୰࡛ኚែ ᗘ㸦ࡍ 7 ᒙ✚ᒙࡋ㸪ࣃࣝࢫ㏻㟁ຍᅽ↝⤖ࡋࡓ㸬TiNi ΰྜ⢊ᮎࡢ ࡞ࢃࡕ᭤ࡆ๛ᛶ㸧ࡀᚎࠎኚࡍࡿ≉ᚩࢆ᭷ࡍࡿ㸬ࡇࡢ〇 ሸ㔞ࡣ Ti-49.8at%Ni ࡽ 50.8at%Ni ࡛ࡣ࠸ࡎࢀࡶ 2.77g 㐀ࡢࡓࡵⴭ⪅ࡽࡣ⢊ᮎ෬㔠ࣉࣟࢭࢫረᛶຍᕤࢆ⤌ ࡋ㸪Ti-51.0at%Ni ࡣ 42.7g ࡋࡓ㸬ࡇࡇ࡛㸪Ti-51.0at%Ni ࡳྜࢃࡏࡓ᪉ἲࢆ᪤ᥦࡋ࡚࠸ࡿ 3)ࡀ㸪ኚែ࣭ኚᙧ≉ᛶ ࡢ TiNi ΰྜ⢊ᮎࡢሸ㔞ࡀࡢ⤌ᡂࡢΰྜ⢊ᮎࡼࡾከ࠸ ࢆヲ⣽ㄪᰝࡋࡓ⤖ᯝࡣሗ࿌ࡋ࡚ࡇ࡞ࡗࡓ㸬 ࡢࡣ㸪↝⤖ᚋࡢ⇕㛫ᢲฟࡋᚋ㸪㔠ᆺࡢᵓ㐀ୖ୍ᐃ㔞ࡀ㔠ᆺ ෆṧᏑࡋ㸪࣡ࣖࡋ࡚ᚓࡽࢀ࡞࠸ࡓࡵ࡛࠶ࡿ㸬↝⤖᮲ † ឡ▱ᕤᴗᏛ ᕤᏛ㒊 ᶵᲔᏛ⛉㸦㇏⏣ᕷ㸧 ௳ࡣ↝⤖ ᗘ 1023K㸪↝⤖㛫 1.8ks ࡋ㸪↝⤖ᚋࡣ⅔෭ †† 㸦ᰴ㸧 ᮾᾏ⌮㟁ᶵ〇సᡤ㸦⩚㒆ཱྀ⏫㸧 ࡋࡓ㸬㏻㟁㛤ጞᚋ 30s ࡣࣃࣝࢫ㏻㟁ࢆ㸪ࡑࡢᚋࡣ┤ὶ㏻㟁 ឡ▱ᕤᴗᏛ⥲ྜᢏ⾡◊✲ᡤ◊✲ሗ࿌㸪➨ 16 ྕ㸪2014 ᖺ 愛知工業大学総合技術研究所研究報告，第 16 号，2014 年 68 Ti powder Ball milling Ni powder Filling Solution treatment Sintering Shape-memory treatment Hot extrusion Fig. 1 Fabrication process of the functionally graded TiNi shape memory alloy wire ࡛↝⤖ࢆ⾜ࡗࡓ㸬↝⤖యࡣ┤ᚄ 20mm㸪㛗ࡉ⣙ 29mm ࡢ 4㸬⤖ᯝ࠾ࡼࡧ⪃ᐹ ᰕᙧ≧࡛࠶ࡗࡓ㸬ࡇࡢ↝⤖యࡢ Ti Ni ࡢ┦ᣑᩓࢆಁࡍ ࡓࡵ㸪┿✵㞺ᅖẼ࡚ฎ⌮ ᗘ 1273K ࢆ 43.2ks ಖᣢࡍࡿ᮲ 4.1㻌 ⇕㛫ຍᕤ䛧䛯䝽䜲䝲䛾ഴᩳᶵ⬟≉ᛶ ௳࡚⁐యฎ⌮ࢆࡋࡓ㸬ࡇࡢ⁐యฎ⌮యᑐࡋ࡚⇕ 4.1.1 ኚែ ᗘ 㛫ᢲฟࡋᡂᙧࡋࡓ㸬⨨ࡢᴫせ࠾ࡼࡧᡂᙧ᮲௳ࡣḟ❶♧ ᙧ≧グ᠈⇕ฎ⌮ᚋࡢ࣡ࣖྛ㒊࡚ ᐃࡋࡓ DSC ᭤⥺ ࡍ㏻ࡾ࡛࠶ࡿ㸬ࡲࡓᙧ≧グ᠈≉ᛶࢆⓎ⌧ࡉࡏࡿࡓࡵ㸪ᢲฟ ࡽᚓࡓ࣐ࣝࢸࣥࢧࢺ㸦martensite㸪௨ୗ M㸧ኚែ ᗘศ ࡋᡂᙧᚋࡢ࣡ࣖᙧ≧グ᠈⇕ฎ⌮ࢆࡋࡓ㸬ᙧ≧グ᠈⇕ ᕸࢆ Ni ⃰ᗘ x/L ࡢ㛵ಀ࡛ Fig. 2 ♧ࡍ㸬 x/L ࡣ࣡ࣖࡢ㛗 ฎ⌮ࢆࡋࡓ࣡ࣖࡣẼ୰࡛ ᗘ 773K ࢆ 3.6ks ಖᣢࡋ㸪 ࡉ L ᑐࡍࡿ ᐃ⨨ x ࡢ┦ᑐ⨨ࢆ♧ࡍ㸬ࡇࡇ࡛ Ni ⃰ᗘ Ỉ෭ࡋ࡚⏝ពࡋࡓ㸬 ࡣ࣡ࣖࡢᶓ᩿㠃ෆࡢ⤌ᡂࡀ୍ᵝ࡛㸪ୟࡘ Ti-49.8at%Ni ࡽ Ti-51.0at%Ni ࡲ࡛㍈᪉ྥ⥺ᙧഴᩳࡋࡓ௬ᐃࡋࡓሙ 3㸬⇕㛫ᢲฟࡋ⨨࠾ࡼࡧᡂᙧ᮲௳ ⁐యฎ⌮యᑐࡋ࡚⇕㛫ᢲฟࡋᡂᙧࡋࡓ㸬ᢲฟࡋᡂᙧ ⏝࠸ࡿࣅࣞࢵࢺࡣ㸪┤ᚄ 20mm ࡢ⁐యฎ⌮యࡽ࣡ ࣖᨺ㟁ຍᕤࡼࡗ࡚┤ᚄ 5mm ࡢᰕᙧ≧ษࡾฟࡋࡓࡶ ࡢࢆ⏝ࡋࡓ㸬₶ࡣ BN㸦❅࣍࢘⣲㸧ࢆ⏝࠸㸪ᡂᙧ ᗘࡣ 1073K ࡋࡓ㸬ᡂᙧ㏿ᗘࡣ 1mm/min ࡋ㸪ᢲฟࡋẚ ࡣ 6.25㸦ࣅࣞࢵࢺ┤ᚄ 5mm㸪࣡ࣖ┤ᚄ 2mm㸧ࡋࡓ㸬 ࡲࡓᙧ≧グ᠈≉ᛶࢆⓎ⌧ࡉࡏࡿࡓࡵ㸪ᢲฟࡋᡂᙧᚋࡢ࣡ ࣖᙧ≧グ᠈⇕ฎ⌮ࢆࡋࡓ㸬ᙧ≧グ᠈⇕ฎ⌮ࢆࡋࡓ࣡ ࣖࡣẼ୰࡛ ᗘ 773K ࢆ 3.6ks ಖᣢࡋ㸪Ỉ෭ࡋ࡚⏝ពࡋ ࡓ㸬ࡉࡽ㸪ᙧ≧グ᠈⇕ฎ⌮ࢆࡋࡓ࣡ࣖࡢኚᙧ≉ᛶࢆ ㄪᰝࡍࡿࡓࡵ㸪ᐊ ࡛ࡢᘬᙇヨ㦂ࢆ⾜ࡗࡓ㸬 ෭㛫ຍᕤࡢኚែ≉ᛶࡢᙳ㡪ࢆㄪᰝࡍࡿࡓࡵ㸪⁐య ฎ⌮ࡋࡓ Ni ⃰ᗘ 49.8at%༢┦↝⤖యࡽᖜ 5mm㸪ཌࡉ 1mm ࡢᖏᯈᮦࢆษࡾฟࡋ㸪⇕㛫ᅽᘏ෭㛫ᅽᘏࢆ⾜ࡗ࡚ DSC ᐃࢆᐇࡋࡓ㸬⇕㛫ᅽᘏࡢ ᗘࡣ⇕㛫ᢲฟࡋᡂᙧྠᵝ 1023K ࡋࡓ㸬⇕㛫࠾ࡼࡧ෭㛫ᅽᘏࡢ᩿㠃ῶᑡ⋡ࡣࡑࢀࡒ ࢀ 15%㸪10%ࡋࡓ㸬 ྜࡢ್ࢆ♧ࡋ࡚࠸ࡿ㸬Ms㸪Mf ࡣ M ኚែࡢ㛤ጞ࣭⤊ ᗘࢆ ࡑࢀࡒࢀ⾲ࡍ㸬M ኚែ ᗘᖜ㸦Ms㸫Mf㸧ࡣ᭱ᑠ࡛ࡶ 78.1K ࡛࠶ࡾ㸪ࡉࡽ Ms Mf ࡑࢀࡒࢀࡢ࣡ࣖ୧➃࡛ࡢᕪࡣ 33.5㸪25.6K ⁐〇ᮦࡢሙྜ 1)ࡢ 1/5 ࡽ 1/6 ⛬ᗘ࡛࠶ࡿ㸬࣡ ࣖ୧➃࡛ࡢ ᗘᕪࡀᑠࡉ࠸ཎᅉࡣ௨ୗࡢࡼ࠺⪃࠼ࡽࢀ ࡿ㸬ᢲฟࡋᡂᙧᚋࡢ࣡ࣖ࠾࠸࡚ࡣ㸪ྠࡌ x ࡢ⨨࠾ ࡅࡿ⾲ᒙ㒊୰ᚰ㒊ࡢ Ni ⃰ᗘࡀ␗࡞ࡗ࡚࠸ࡿ㸬DSC ᐃࡢ 㝿ࡣ㛗ᡭ᪉ྥᑐࡋ࡚ᆶ┤ษࡾฟࡋࡓヨᩱࢆ⏝࠸ࡓࡓ ࡵ㸪」ᩘࡢ⤌ᡂࡢᒙࡀΰᅾࡍࡿ≧ែ࡛ኚែ ᗘࢆㄪᰝࡋ ࡓࡇ࡞ࡿ㸬ࡇࡢࡓࡵタᐃࡋࡓ Ni ⃰ᗘࡢᕪࡀ⌧ࢀ࡞ ࡗࡓࡶࡢ⪃࠼ࡽࢀࡿ㸬 ࡇࡢ᳨ウࡍࡁ㡯┠ࡣ㓟≀ࡢᙳ㡪࡛࠶ࡿ㸬⇕㛫ᢲ ฟࡋᡂᙧࡣẼ୰࡛⾜࠸㸪ୟࡘࣅࣞࢵࢺࡣ᪼ 㛫ࢆྵࡵ ࡿ 3 㛫⛬ᗘ㧗 ᭚ࡉࢀࡿ㸬ࡇࡢ㛫ࡢ㓟ࡣ㑊ࡅࡽࢀ ࡎ㸪㓟≀ࡀᑡ࡞ࡽࡎ⏕ᡂࡋ࡚࠸ࡿࡣࡎ࡛࠶ࡿ㸬XRD ศ ᯒࡸඖ⣲ศᯒ࡛ࡣ☜ㄆ࡛ࡁ࡞ࡗࡓࡀ㸪୍⯡ⓗ㓟≀ࡢ ⏕ᡂࡣ≉࣡ࣖ⾲ᒙ㒊࡛㢧ⴭ࡛࠶ࡿ㸬Ni ẚ㍑ࡋ࡚άᛶ ࡞ Ti ࡀ✚ᴟⓗ㓟≀ࢆ⏕ᡂࡍࡿࡇ࡛┦ᑐⓗ Ni ⃰ᗘ ࡀቑຍࡋ㸪యⓗኚែ ᗘࡀపୗࡍࡿࡇࡀணࡉࢀࡿ ࡀ㸪ヲ⣽ࡣᚋ᳨ウࡍࡿᚲせࡀ࠶ࡿ㸬 ⢊ᮎ෬㔠ረᛶຍᕤࡼࡿഴᩳᶵ⬟ᙧ≧グ᠈ྜ㔠ࡢస〇 粉末冶金と塑性加工による傾斜機能形状記憶合金の作製 69 Ni content [at%] 49.8 50.0 50.2 50.4 50.6 50.8 51.0 600 Ms 330 300 270 Ti-51.0at%Ni Shape-memory treated Crosshead speed = 1mm/min T = RT 500 Nominal stress [MPa] Martensitic transformation temperatures [K] 360 Ti-50.6at%Ni Ti-50.4at%Ni 400 300 200 Mf 240 100 210 0 0.0 0.2 0.4 0.6 0.8 1.0 0 Relative distance from edge x/L Fig. 2 Distribution of the martensitic transformation temperatures for shape-memory treated wire 1 2 3 4 5 6 7 Nominal local strain [%] Fig. 3 Nominal stress-local strain curves obtained at each composition of the shape-memory treated wire 4.1.2㻌 ኚᙧ≉ᛶ 4.2 ෭㛫ຍᕤࡼࡿኚែ≉ᛶࡢኚ ᙧ≧グ᠈⇕ฎ⌮ࢆࡋࡓ࣡ࣖ࠾࠸࡚㸪ᐊ ࡛ࡢᘬᙇ 3 ❶࡛㏙ࡓ᪉ἲ࡛⇕㛫ᅽᘏ࠾ࡼࡧ⇕㛫෭㛫ᅽᘏࡢ୧ ヨ㦂ࡽᚓࡽࢀࡓබ⛠ᛂຊ㸫බ⛠ᒁᡤࡦࡎࡳ᭤⥺ࢆ ᐃ⟠ ᪉ࢆࡋࡓ㸪Ni ⃰ᗘ 49.8at%༢┦ࡢᖏᯈᮦ࠾ࡅࡿຍ⇕㐣 ᡤࡢ x/L ࡽồࡵࡓ Ni ⃰ᗘࡶ Fig. 3 ♧ࡍ㸬ᙧ≧グ ⛬ࡢ DSC ᭤⥺ࢆ Fig. 4 ♧ࡍ㸬As ࠾ࡼࡧ Af ࡣ㏫ኚែ㛤ጞ ᠈⇕ฎ⌮ᚋࡢ࣡ࣖࡣ Ti-50.4at%Ni ࡢ⨨࡛ᙧ≧グ᠈ຠᯝ ࠾ࡼࡧ⤊ ᗘࢆࡑࢀࡒࢀ⾲ࡍ㸬෭㛫ᅽᘏࢆࡉ࡞࠸ሙྜ ࢆ㸪Ti-51.0at%Ni ࡢ⨨࡛㉸ᙎᛶࢆࡑࢀࡒࢀ♧ࡍࡇࡀࢃ ࡢࣆ࣮ࢡẚ㍑ࡍࡿ㸪෭㛫ᅽᘏᚋࡢࣆ࣮ࢡࡣ㗦ࡃ㸪ኚែ ࡿ㸬ࡲࡓ㸪Ti-50.6at%Ni ࡢ⨨࡛ࡣ㒊ศ㉸ᙎᛶࡀ⌧ࢀ࡚࠸ࡿ㸬 ᗘᖜ㸦Af 㸫As㸧ࡀᑠࡉࡃ࡞ࡗ࡚࠸ࡿࡇࡀࢃࡿ㸬ࡲࡓ㸪 M ኚ ែ ᛂ ຊ ࢆ Ti-50.4at%Ni ࡢ ⤖ ᯝ ẚ ㍑ ࡍ ࡿ 㸪 ෭㛫ᅽᘏ๓ࡣ」ᩘẁࡢኚែࣆ࣮ࢡࡀ⌧ࢀࡓࡀ㸪෭㛫ᅽᘏ Ti-50.6at%Ni ࡛ 90MPa ⛬ᗘ㸪Ti-51.0at%࡛ 150MPa ⛬ᗘ㧗࠸ ᚋࡣ୍ࡘ࡞ࡗ࡚࠸ࡿ㸬ࡇࢀࡣ෭㛫ᅽᘏࡼࡗ࡚ᚤどⓗ ⤖ᯝ࡞ࡗࡓ㸬ࡲࡓ㸪㈇Ⲵึᮇࡢᙎᛶಀᩘࡣ Ti-50.4at%Ni ࡞ Ni ⃰ᗘࡢࡺࡽࡂࡀᢚไࡉࢀ㸪ᮦᩱෆࡢ⤌ᡂࡀᆒ୍࡞ ࡛⣙ 25GPa㸪Ti-50.6at%Ni ࡛⣙ 50GPa 㸪Ti-51.0at%Ni ࡛⣙ ࡗࡓࡇࢆ♧၀ࡍࡿ⤖ᯝ࡛࠶ࡾ㸪⁐〇ᮦྠᵝࡢഴྥ࡛࠶ 45GPa ࡛࠶ࡾ㸪Ti-50.4at%Ni ࡛ࡣ M ┦㸪Ti-50.6at%Ni ࠾ࡼ ࡿ㸬ᚋࢡࢳ࢚࣮ࣗࢱࡋ࡚ᛂ⏝ࡍࡿሙྜࡣ㸪ኚែ ࡧ Ti-51.0at%Ni ࡛ࡣẕ┦ࡢᙎᛶಀᩘ 4)ࡰ୍⮴ࡋࡓ㸬௬ ᗘᖜࢆ⊃ࡵ࡚ ᗘኚࡼࡿᙧ≧ᅇࡢᛂ⟅ࢆ᪩ࡃࡍࡿ ᙧ≧グ᠈⇕ฎ⌮ᚋࡢ࣡ࣖࢆయෆ࡛࢞ࢻ࣡ࣖࡋ࡚ ᚲせࡀ࠶ࡾ㸪⢊ᮎ෬㔠ࣉࣟࢭࢫ࡛స〇ࡋࡓ SMA ࠾࠸࡚ ⏝ࡍࡿࡇࢆᐃࡋࡓሙྜ㸦ᐇ㝿┤ᚄ 2mm ࡢ࣡ࣖࢆࡑ ෭㛫ຍᕤࡢ᭷⏝ᛶࢆ♧ࡋ࡚࠸ࡿ㸬 ࡢࡲࡲ⏝࠸ࡿࡇࡣᅔ㞴࡛࠶ࡿࡀ㸧㸪ప Ni ⃰ᗘഃࢆ࢞ࢻ ࣡ࣖࡢඛ➃ࡍࢀࡤ㸪ඛ➃࡛ప๛ᛶࡢ㸦ᰂ㌾ᛶࡢ㧗࠸㸧 ≉ᛶࡀ㸪ᮎ➃ࡣ㧗๛ᛶࡢ㸦᧯సᛶࡢ㧗࠸㸧≉ᛶࡀᚓࡽࢀࡿ㸬 5㸬⤖ゝ ࡇࡢࡼ࠺㸪⏝㏵ྜࢃࡏ࡚ SMA ࡢ␗࡞ࡿᶵ⬟≉ᛶࢆ㐃⥆ ⓗኚࡉࡏ࡞ࡀࡽᘬࡁฟࡍࡇࡀྍ⬟࡞ࡿࡇࢆ♧၀ ኚែ ᗘࡢഴᩳᶵ⬟≉ᛶࢆ᭷ࡍࡿ TiNi SMA ࣡ࣖస〇 ࡍࡿ⤖ᯝࡀᚓࡽࢀࡓ㸬 ࠾࠸࡚㸪⇕㛫ᢲฟࡋᡂᙧ࡛ᚓࡽࢀࡓ࣡ࣖࡘ࠸࡚ኚែ ࡇࢀࡲ࡛㏙࡚ࡁࡓ⤖ᯝࡽ㸪ᮏ◊✲ࡢᡭἲ࡛ࣅࣞࢵ ≉ᛶ㸪⤌⧊ᙧែ࠾ࡼࡧኚᙧ≉ᛶࡘ࠸࡚ᐇ㦂ⓗㄪᰝࡋࡓ㸬 ࢺ࠾ࡼࡧ࣡ࣖࢆస〇ࡍࢀࡤ㸪࣡ࣖࡣኚែ ᗘࡢഴᩳᶵ ௨ୗᚓࡽࢀࡓᡂᯝࢆせ⣙ࡋ࡚♧ࡍ㸬 ⬟≉ᛶࢆ᭷ࡋ㸪ࡇࢀకࡗ࡚࣡ࣖෆࡢ⨨ࡼࡾᙧ≧グ ᠈ຠᯝ㉸ᙎᛶࡢ␗࡞ࡗࡓኚᙧ≉ᛶࢆ♧ࡍࡇࡀ᫂ࡽ ࡞ࡗࡓ㸬 (1) ⇕㛫ᢲฟࡋᡂᙧ࡛ᚓࡽࢀࡓ࣡ࣖᙧ≧グ᠈⇕ฎ⌮ ࢆ⾜࠺ኚែ ᗘࡢഴᩳᶵ⬟≉ᛶࡀ⌧ࢀࡿ㸬 (2) ᙧ≧グ᠈⇕ฎ⌮ࢆ⾜ࡗࡓ࡛࣡ࣖࡣ㸪⨨ࡼࡗ࡚ᙧ ឡ▱ᕤᴗᏛ⥲ྜᢏ⾡◊✲ᡤ◊✲ሗ࿌㸪➨ 16 ྕ㸪2014 ᖺ 愛知工業大学総合技術研究所研究報告，第 16 号，2014 年 70 ࡢ෭㛫ຍᕤࡼࡾኚែ ᗘᖜࡢ⊃ᑠࡼࡿ⇕ᛂ⟅ᛶࡢᨵ ၿࡀྍ⬟࡛࠶ࡿࡇࢆ᫂ࡽࡋࡓ㸬 ㅰ㎡ ᮏ◊✲ࡢ୍㒊ࡣ㈈ᅋἲே᪥ᮾᏛ⾡⯆㈈ᅋࡢ◊✲ຓᡂ㔠 ࡼࡗ࡚Ⅽࡉࢀࡓࡶࡢ࡛࠶ࡿࡇࢆグࡋ㸪ㅰពࢆ⾲ࡍࡿ㸬 ཧ⪃ᩥ⊩ 1) Otsuka, K., and Ren, X., Physical metallurgy of Ti–Ni-based shape memory alloys, Progress in Materials Sciences, 50, pp. 511-678, (2005). Fig. 4 DSC curves of the SMA plates subjected to 5% hot rolling and then 10% cold rolling 2) Tobushi, H., Matsui, R., Takeda, K. and Pieczyska, E.A., ≧グ᠈ຠᯝ㉸ᙎᛶࡢ␗࡞ࡗࡓ≉ᛶࢆ♧ࡍ㸬 3) ᯇⰋ, ிᴟ⚽ᶞ, ྜྷ⏣⥲ோ, ⢊ᮎ෬㔠ࣉࣟࢭࢫረ Mechanical Properties of Shape Memory Materials, Nova Science Publishers, (2013). (3) ⢊ᮎ෬㔠ࣉࣟࢭࢫ࡛స〇ࡋࡓ SMA ࠾࠸࡚ࡶ㸪෭㛫 ᛶຍᕤࡼࡿഴᩳᶵ⬟ TiNi ᙧ≧グ᠈ྜ㔠࣡ࣖࡢస〇 ຍᕤࡼࡗ࡚ኚែ ᗘᖜࢆᑠࡉࡃࡍࡿࡇࡀྍ⬟࡛ (➨ 1 ሗ㸸TiNi ᙧ≧グ᠈ྜ㔠ࣅࣞࢵࢺࡢస〇ࡑࡢኚែ≉ ࠶ࡿ㸬 ᛶ), ᪥ᮏᶵᲔᏛㄽᩥ㞟 A, 74 (746), pp. 1336-1341, ௨ୖࡢࡇࡽ㸪ഴᩳᶵ⬟≉ᛶࢆ᭷ࡍࡿ TiNi SMA ↝⤖యࢆ ⣲ᮦࡋ࡚⇕㛫ᢲฟࡋᡂᙧࢆ⾜࠺ࡇࡼࡾ㸪ᚓࡽࢀࡿ࣡ ࣖࡶࡲࡓኚែ ᗘࡢഴᩳᶵ⬟≉ᛶࢆ᭷ࡋ㸪ࡉࡽࡑࡢᚋ (2008). 4) ⏣୰႐ஂ, ᡞఅኖ, ᐑᓮಟ୍, ᙧ≧グ᠈ྜ㔠ࡢᶵᲔ ⓗᛶ㉁, 㣴㈼ᇽ, (1993).
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