㔠ᒓ⣔ᵓ㐀䞉ᶵ⬟ᮦᩱ䛾䝘䝜⤌⧊ Keyword : ຍᕤ䝥䝻䝉䝇䚸䝬䜾䝛䝅䜴䝮ྜ㔠䚸㔠ᒓ㛫ྜ≀䚸㔠ᒓ䜺䝷䝇 ⊂❧⾜ᨻἲே㻌 ≀㉁䞉ᮦᩱ◊✲ᶵᵓ ᄂᆮỉ Ꮡ ㏆ᖺ䚸㔠ᒓ⣔ᮦᩱ䛾⤌⧊ᴟᚤ⣽䛻㛵䛩䜛◊✲䛜ᅜ㝿ⓗ䛻䜒㠀ᖖ䛻┒䜣䛷䛒䜛䚹≉䛻 Equal Channel Angular Pressing (ECAP)ἲ䜔䠝cumulative Roll Bonding (ARB)ἲ䛺䛹 䛾᪂䛧䛔ຍᕤἲ䜢⏝䛧䛯⤌⧊ᴟᚤ⣽䛻䜘䜛ᵓ㐀ᮦᩱ䛾㧗ᙉᗘ䛾䛜ሗ࿌䛥䜜䛶䛔 䜛䚹 ᄂᆮỉ ཀྵẟ 㔠ᒓ㛫ྜ≀䚸㠀ᬗ㉁ྜ㔠䚸hcp㔠ᒓ䛺䛹䛾㞴ຍᕤᮦᩱ䛻䛴䛔䛶䚸㧗ᅽ䛽䛨䜚ຍᕤ䠄HighPressure Torsion䠅ἲ䛻䜘䜛ᙉຍᕤ䛸䝘䝜ᵓ㐀ᙧᡂ䚸≉␗ᶵ⬟Ⓨ⌧䛻㛵䛩䜛◊✲䜢⾜䛳䛶 䛔䜛䚹 இέᇢᄂᆮἚἦἕἁἋ 䝬䜾䝛䝅䜴䝮ྜ㔠䛾䝘䝜ᵓ㐀 㧗ᅽ䛽䛨䜚ຍᕤ (High-Pressure Torsion) shear strain: J SrN / t equivalent strain: H J ᨃ㟼Ỉᅽୗ䠄ࠥ5GPa)䛷ヨᩱ䛻䛝䛺᩿䜂䛪䜏䜢 㔠ᒓ㛫ྜ≀䚸㠀ᬗ㉁ᮦᩱ䛺䛹䛾㞴ຍᕤᮦ䛻䜒㐺⏝ྍ⬟ Mg-Znྜ㔠䛾HPTຍᕤ୰䛻Mg4Zn7, MgZn2䝘䝜⢏Ꮚ䛜ືⓗᯒฟ ⢏⏺䝢䞁Ṇ䜑ຠᯝ䛻䜘䜚䚸⤖ᬗ⢏ᚄ140 nm䜎䛷ᚤ⣽䞉㧗ᙉᗘ 㔠ᒓ䜺䝷䝇䛾ᵓ㐀ⱝ㏉䜚䛻䜘䜛᩿ᖏᢚไ As-Cast N = 10 N = 50 N = 50+(673 K,1 hr) TiNiྜ㔠䛾䝘䝜⤖ᬗ䠋㠀ᬗ㉁ TiNi N=10 200 nm 500 nm Zr⣔㔠ᒓ䜺䝷䝇䜢HPTຍᕤ䛩䜛䛣䛸䛷ཎᏊᵓ㐀䛜ኚ 䝘䝜◳䛥䛸ᙎᛶ⋡䛾ᖜ䛺పୗ䛸᩿ᖏᢚไ ૨ᴾ ྂᴾ LJƱNJ ་⒪䝕䝞䜲䝇ᮦᩱ䛸䛧䛶㔜せ䛺TiNi䜢HPTຍᕤ䛻䜘䜚㠀ᬗ㉁ 䝍䞁䝟䜽㉁྾╔ᣲື䛾ኚ ⣽⬊ᇵ㣴ᾮ୰䜈䛾Ni䜲䜸䞁⁐ฟ㔞䜢ᖜ䛻๐ῶ F. Q. Meng, J. Rosalie, A, Singh, H. Somekawa and K. Tsuchiya, “Ultrafine Grain Formation in Mg-Zn Alloy by in situ Precipitation during High-Pressure Torsion” Scripta Mater., 78-79(2014)57-60. D. N. Awang Shri, Koichi Tsuchiya and Akiko Yamamoto, “Effect of high-pressure torsion deformation on surface properties and biocompatibility of Ti-50.9¯>-. %Ni alloys”, Biointerphases, 9(2014)0290071-10. F. Q. Meng, K. Tsuchiya, S. II and Y. Yokoyama, “Reversible Transition of Deformation Mode by Structural Rejuvenation and Relaxation in Bulk Metallic Glass”, Appl. Phys. Lett., 101(2012)121914. ܱဇ҄ƷႸ z ᵝ䚻䛺㔠ᒓ⣔ᵓ㐀䞉ᶵ⬟ᮦᩱ䛻䛴䛔䛶䚸㧗ᅽ䛽䛨䜚 z 䝇䝔䞁䝖䛺䛹䛾⾑⟶ෆ␃⨨ᆺ་⒪䝕䝞䜲䝇䛿ᑠᆺ ⷧ⫗䛸㉸⪏㣗ᛶ䛜せồ䛥䜜䛶䛚䜚䚸䝘䝜ᵓ㐀TiNi ຍᕤ䛻䜘䜛䝘䝜ᵓ㐀ไᚚ䛸≉␗≀ᛶ䛾Ⓨ⌧䜢ぢ䛔䛰 ྜ㔠䛿㧗ᙉᗘ䛺䛖䛘䛻⪏㣗ᛶ䜒㧗䛟䚸᪂䛧䛔་⒪䝕 䛧䛯 䝞䜲䝇ᮦᩱ䛸䛧䛶᭷ᮃ ඖ⣲ᡓ␎ᮦᩱ䝉䞁䝍䞊㻌 䝉䞁䝍䞊㛗㻌 ᅵ㇂㻌 ᾈ୍ E-mail : TSUCHIYA.Koichi䖃nims.go.jp URL : http://www.nims.go.jp/group/msdg/index-j.html㻌 㻌 㻌 㻌 — 402 —
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