第５章 職員人事異動
SYSTEMS 25 (3): 330-335 MAY 2005
4. ฦකฦᯊἪ࡞࠽ࡄࡾທ㉫ᶭᵋࡡよ᪺
ᮇ◂✪㒂࡚ࡢࠉ㞹ᏄฦකἪ࡞࠽ࡄࡾ࢛࣭ࢩ࢘㞹ᏄࡷX ⥲ක㞹Ꮔࢪ࣋ࢠࢹࣜࡡᨲฝᶭᵋ࡞ࡗ࠷
࡙レ⣵᳠ゞࢅ⾔ࡖ࡙࠷ࡾࠊࡆࡿࡢ々ྙ㓗∸⣌ࡡ々㞟ࢪ࣋ࢠࢹࣜࡡよ㔐ཀྵࡦᏽ㔖ሒ
ࢅᚋࡾࡒࡴࡡᇱ♇ࢸ࣭ࢰࡡ㞗ࢅ┘Ⓩ࡛ࡊ࡙࠷ࡾࠊᮇ◂✪㒂࡚ࡢࠉཋᏄฦකἪ࡞࠽ࡄࡾທ㉫ᶭ ᵋ࡞ࡗ࠷࡙ࡡᵕࠍᨲ㞹ࣈࣚࢫ࣏(ICP, MIP, glow discharge plasma, spark discharge plasma, and laser-induced plasma)࠾ࡼࡡࢪ࣋ࢠࢹࣜࢅᑊ㇗࡞᳠ゞࡊ࡙࠷ࡾࠊࡆࡿࡢࣈࣚࢫ࣏ທ㉫″
ࡡ᭩㐲ࡡࡒࡴࡡᇱ♇ࢸ࣭ࢰࡡ㞗ࡷࠉἴ㛏⾪ࢸ࣭ࢰ࣭࣊ࢪࡡషᠺ࡞⾔࠹ࡆ࡛ࢅ┘Ⓩ࡛ࡊ࡙࠷
ࡾࠊ
Ref. 1 K. Wagatsuma and H. Honda
Comparative studies on excitation of nickel ionic lines between argon and krypton glow
discharge plasmas
Spectrochimica Acta Part B, 60, (2005) 1538-1544.
Ref. 2 Y. Ushirozawa and K. Wagatsuma
Excitation mechanisms of copper ionic and atomic lines emitted from a low-pressure argon
laser-induced plasma
Spectroscopy Letters, 28 (2005), 539-556.
Ref. 3 T. Maeda and K. Wagatsuma
Direct loading of ethanol solution into high-power nitrogen-oxygen mixed gas microwave
induced plasma and the emission characteristics Spectrochimica Acta Part B, 60 (2005) 81-87.
Ref. 4 T. Maeda, K. Wagatsuma, and Y. Okamoto
Direct determination of several elements in MIBK extract by high-power nitrogen-oxygen
mixed gas micreowave induced plasma optical emission spectrometry Analytical and Bioanalytical Chemistry, 382 (2005) 1152-1158.
Ref. ⸠ᮟࠉᒜᮇපࠉᠻጏ ᪺
⮤ᕤࣁࢪ㞹Ὦ༰ຊ㧏࿔ἴࢡ࣭ࣞᨲ㞹ⓆකฦᯊἪ࡞ࡻࡾ㗨୯ࡡ᚜㔖㖙ࠉࢼࢴࢢࣜࠉࢲ ࢰࣤࠉ
࣌⣪ࡡᏽ㔖
㕪࡛㗨, 91, (2005), 501-504.
࠘◂✪ゝ⏤࠙
㸦㸣ᐁ⏕ฦᯊ⨠ࡡ㛜Ⓠ
(1) ᮇ◂✪㒂࡞࠽࠷࡙㛜ⓆࡊࡒᨭⰃᆵࢡ࣭ࣞᨲ㞹ࣈࣚࢫ࣏ທ㉫″ࢅ⏕࠷ࡒⓆකฦᯊ⨠ࢅ⿿ష ࡌࡾࠊ㕪㗨࣒࣭࢜➴ࡡ༝ງࢅᚋ࡙ࠉ࢛ࣤࣚࣤ㸤࢛ࣤࢦࢹฦᯊ⨠࡛ࡊ࡙ࡡ㐘⏕ࢅ⾔࠷ࠉᐁ 㝷㐘⏕ࡡ࠽ࡄࡾၡ㢗Ⅴࡷ᭞ࡾᨭⰃⅤࢅฝࡌࡾࠊࡆࡡฦᯊ⨠ࡢࠉppm(10-4%)ࣝ࣊ࣜࡱ࡚ࡡ
᚜㔖ඔ⣪ࡡኣඔ⣪ྜྷᏽ㔖ࢅᴣࡠ 1 ฦ௧හ࡞Ᏸ࡚ࡀࠉࡐࡡ࡛ࡀࡡฦᯊ⢥ᗐ࡛ࡊ࡙┞ᑊᵾ‵೩
ᕣ5%௧හ࡛ࡾࡵࡡࢅ┘ᵾ࡛ࡌࡾࠊ
(2) ࣭ࣝࢧㄇ㉫ࣈࣚࢫ࣏Ⓠකฦᯊ࡞࠽࠷࡙ࡢࠉࣈࣚࢫ࣏ࢬࣜ➴ࢅ⿿షࡊࠉࢪࢠࣚࢴࣈ⣪ᮞ➴ࡡ ࡈࡱࡉࡱฦᯊᑊ㇗࡞ᑊᚺ࡚ࡀࡾฦᯊ⨠ࡡモషࢅ⾔࠹ࠊ
(3) ᴗ᚜㔖ฦᯊ࡚ࡢICPⓆක㸤㈻㔖ฦᯊἪࡡモᩩࡡ๑ฌ⌦ᢇ⾙ࡡ᳠ゞࡊࠉฦᯊ᧧ష࡞࠽ࡄࡾỗ
ࡂ㧏 ᛮ⬗ ฦ 㞫࣬ ⃨⦨ Ἢࡡ 㛜Ⓠ ࢅ⾔ ࠹ࠊ ࡆ ࡡฦᯊ ⨠ ࡞さịࡈ ࡿࡾ ᛮ⬗ ࡛ࡊ ࡙ࠉ
ppb(10-7%)ࣝ࣊ࣜࡡᴗ᚜㔖ඔ⣪ࡡᏽ㔖ࢅࠉ┞ᑊᵾ‵೩ᕣ5%௧හ࡚Ᏸ࡚ࡀࡾࡆ࡛ࢅ┘ᵾ࡛ࡌ
ࡾࠊ
㸧㸣᩺ฦᯊ᪁Ἢࡡ᳠ゞ
(1) ᚉᮮᆵ࡞ࡢ࠷ฦᯊ≁ᛮࢅᣚࡗⓆකฦᯊ⏕ࡡࣈࣚࢫ࣏ທ㉫″ࡡ◂✪ࢅ⾔࠹ࠊᅖమモᩩࡡ├
ฦᯊ⏕ࡡ᩺ࡊ࠷ທ㉫″࡛ࡊ࡙ࠉ࣭ࣝࢧࣇ࣭ࣝࢨࣘࣤ࡞ࡻࡾモᩩᑙථ࡛ࢡ࣭ࣞᨲ㞹ࣈࣚࢫ࣏
ࢅ⤄ࡲྙࢂࡎࡒທ㉫″ࡷ㸨㞹ᴗᆵ୯✭㝔ᴗᆵࢡ࣭ࣞᨲ㞹ທ㉫″➴ࡡฦක≁ᛮ࡞ࡗ࠷࡙᳠ゞࡌࡾࠊ ࡆࡿࡼࡢࠉモᩩࡡࢦࣤࣈࣛࣤࢡ㐛⛤࡛ທ㉫㐛⛤ࢅ≺❟ࡊ࡙โᚒࡌࡾࡆ࡛࡚ࡀࡾࡒࡴࠉࡻࡽ㧏
ᛮ⬗ࡡທ㉫″࡛ࡊ࡙⏕࡚ࡀࡾྊ⬗ᛮ࠵ࡾࠊ
(2) Okamoto-cavityࢅ⏕࠷ࡒ࣏ࢠࣞἴㄇᑙࣈࣚࢫ࣏ࢅທ㉫″࡛ࡊࡒฦකฦᯊ࡚ࡢࠉࣈࣚࢫ࣏
࢝ࢪ࡞ࡻࡾທ㉫≁ᛮ➴ࢅ᭞࡞レ⣵࡞᳠ゞࡊࠉࡆࡡࣈࣚࢫ࣏ࡡฦᯊᚺ⏕ࡡྊ⬗ᛮ࡞ࡗ࠷࡙᥀ࡾࠊ (3) ࣒࣭ࢩฦකჹ࡛㸧ḗඔCCD᳠ฝ⣪Ꮔ࠾ࡼᵋᠺࡈࡿࡾῼᏽ⨠ࢅᑙථࡊࠉ࣭ࣝࢧㄇ㉫ࣈࣚ
ࢫ࣏ࡡ✭㛣ฦᕱࡷࢡ࣭ࣞᨲ㞹ࣈࣚࢫ࣏࠾ࡼࡡⓆකࡡ㸨ḗඔよᯊࠉཋᏄⓆකฦᯊ࡞࠽ࡄࡾ᩺
ࡒよᯊ᪁Ἢ࡞ࡗ࠷࡙᳠ゞࡌࡾࠊ
㸨㸣ᇱ♇ࢸ࣭ࢰࡡよᯊ
(1) X ⥲ක㞹ᏄฦකἪ࡞࠽࠷࡙ࡢࠉ㞹Ꮔᨲฝ➴ࡡレ⣵ᶭᵋࡡよ᪺࠽ࡻࡦᐁ㝷ࢪ࣋ࢠࢹࣜࡡ㞗 ࡡࡒࡴࠉࡈࡱࡉࡱྙ∸ࡡῼᏽࢅ㐅ࡴࡾࠊ
(2) ཋᏄⓆකฦᯊἪ࡞࠽࠷࡙ࡢࠉἴ㛏Ἢࢸ࣭ࢰ࣭࣊ࢪࡡᣉඖࢅᅒࡾࡒࡴࠉᵕࠍࣈࣚࢫ࣏ທ㉫
″࡞ࡻࡽᚋࡼࡿࡾࢪ࣋ࢠࢹࣜ⥲ࡡῼᏽࢅᘤࡀ⤾ࡀ⾔࠹ࠊࡱࡒࠉທ㉫ᶭᵋࡡよ᪺࠽ࡻࡦࡐࡡທ㉫
″࡞ࡻࡾᕣ␏ࢅ᪺ࡼ࠾࡞ࡌࡾࠊ
㸣
ࢻࢿ㔘ᒌ㧏ῺᮞᩩᏕᐞ㜻◂✪㒂㛓
ᐂဤᩅᏭᙢ ḗ
㸝㹳㸞
࠘ᵋᠺဤ࠙
ᐂဤᩅ㸯Ꮽᙢḗ㸤ᐂဤຐᩅ㸯㕪ฺක㸤ᐞ㜻◂✪㒂㛓ᩅဤ㸯᩺⏛ᗀ⾔ࠉ㧏ᮄΰୌ
ຸఫဤ㹐1ྞ㹒㸤ᢇ⾙ఫဤ㹐1ྞ㹒㸤◂✪⏍㹐1ྞ㹒
࠘◂✪ᠺᯕ࠙
ᮇᐞ㜻◂✪㒂㛓࡞࠽࠷࡙ࡢࠉࠔࢻࢿ࣒ࢰࣚࢩ࣭ࠕࡡ☔❟࡞ྡྷ࠾ࡖ࡙ࠉ 㸝1㸞Feࢅጙࡴ࡛ࡌࡾ⣟㔘ᒌࡡ㉰㧏⣟ᗐ࡛ࡐࡿࡼࡡྙ㔘ࠉ
㸝2㸞ࡐࡿࡼ࡞ྱࡱࡿࡾ⣟∸ඔ⣪ࡡᴗ᚜㔖ᏽ㔖(0.1ppm௧ୖࠉ100ng/g௧ୖ)ࠉ
㸝3㸞㉰㧏⣟ᗐࡊࡒ㔘ᒌࡡ≁ᛮよ᪺࡞ࡻࡖ࡙ࠉ㔘ᒌᮇᮮࡡᛮ㈻ࠉྙ㔘ඔ⣪ࡡຝᯕࠉ⣟∸
ඔ⣪ࡡᙫ㡢ࡡよ᪺࠽ࡻࡦⓆ⌟ࡌࡾ⌟㇗ࡡ࣒࢜ࢼࢫ࣑よ᪺ࡡᏕ⾙Ⓩᇱ♇◂✪ࢅ᥆㐅ࡊ ࡒࠊ
ࡐࡡᠺᯕ࡛ࡊ࡙
㸝1㸞㉰㧏⣟ᗐ
FZ⢥⿿⨠ࢅ⏕࠷࡙ࠉSࢅ3.7ppm(ȣg/g)ྱࡳ㧏⣟ᗐFeࡡ㧏⣟ᗐࢅ⾔࠷ࠉS0.4ppm࡞
΅࡚ࡀࡾࡆ࡛ࢅ☔ヾࡊࠉ㉰㧏⣟ᗐFeࡡ㉰ࠍ㧏⣟ᗐࢅ㐅ࡴࡒࠊNi, Co࡞ࡗ࠷࡙㉰㧏⣟ᗐࡊࠉ
C, N, O, Sࡡ࢝ࢪᠺฦ⣟∸ඔ⣪ᏽ㔖ࢅྱࡲ࡚99.999%௧୕ࡡ㉰㧏⣟ᗐࢅ㐡ᠺࡊࡒࠊࡱ
ࡒࠉᴗࡴ࡙ὩᛮTiࡡ㉰㧏⣟ᗐ࡞ᣦᡋࡊࠉ⣟ᗐ99.996% ௧୕ࡡTiࢅ⁈⿿ࡊࡒࠊ≁࡞΅
ᅏ㞬࡚࠵ࡾOࢅ30ppm௧ୖ࡞ᢒ࠻ࡾ⁈よἪࢅ☔❟ࡌࡾࡆ࡛࡚ࡀࡒ(ㄵᩝⓆ⾪ῥ ᩝ⊡1)ࠊ 㸝2㸞ᴗ᚜㔖ᏽ㔖
㉰㧏⣟ᗐFe୯ࡡC, S, N, Oࡡᴗ᚜㔖ᏽ㔖Ἢࡡ㛜Ⓠ࡞ࡗ࠷࡙ࠉᖳᗐࡵᣦᡋࡊ⤾ࡄࡒࠊ≁࡞ࠉ S࡞ࡗ࠷࡙ࡢࠉICP-MSࢅ⏕࠷࡙ 0.1ppm ௧ୖࡡᏽ㔖ྊ⬗ฦᯊἪࢅぜฝࡊࡒࠊ
㸝3㸞≁ᛮよ᪺
㹷㧏⣟ᗐFe-Cr⣌ྙ㔘ࡡࢪࣅࢿ࣭ࢱࣜฦよ࡞࠽ࡄࡾᵋ㏸ን㹸ࠉࠔ㉰㧏⣟ᗐࡡ㧏㏷ሣᛮንᙟ࡞ཀྵ
ࡌ⣟ᗐࡡຝᯕࠕࠉࠔ㧏ᘿງ㗨ࡡ≁ᛮ࡞ཀྵࡌỀ⣪ࡡᙫ㡢ࠕࠉࠔFe-Cr⣌ྙ㔘ࡡỀ⣪ㄇ㉫ࡿវུᛮࠕࠉ ࠔFe-Cr⣌ྙ㔘ࡡᚺງ⭁㣏ࡿࠕ࠽ࡻࡦ㹷Feࡡᴗ᚜㔖⣟∸ᏽ㔖㹸࡞㛭ࡌࡾ◂✪ࢅᐁ᪃୯ࠊ ࡆࡡᇱ♇◂✪࡞ࡻࡖ࡙Ⓠᤸࡊࡒ㣍㌅Ⓩ㧏Ὼ≁ᛮࢅ᭯ࡌࡾ㠁᩺Ⓩ㔘ᒌࢅᇱ࡞ࠉ⌟ᅹ᥆㐅୯ࡡ NEDOࠔࢻࢿ࣒ࢰࣜᢇ⾙ࣈࣞࢩ࢘ࢠࢹࠕ࡞࠽࠷࡙ࠉᐁ⏕࡞㛭ࡌࡾᇱ♇Ⓩ◂✪ࢅᒈ㛜ࡊࡒࠊࡆ
ࡿࡼࡡ◂✪ᠺᯕࡢࠉᖲᠺ17ᖳ11᭮࡞㛏ᓧ࡚㛜തࡈࡿࡒ㹷㉰㧏⣟ᗐ࣭࣊ࢪ࣒ࢰࣜᅗ㝷ఌ㆗㹸ࡷ㹷
ᮇ㔘ᒌᏕఌㅦⁿኬఌ㹸࡞࠽࠷࡙ሒ࿈ࡈࡿࡒࠊ
Ref. 1 S.Takaki and K.Abiko,
Mater.Trans.47(2006) p156-161.
Purification of Cobalt, Nickel, and Titaniumby Cold-Crucible Induction Melting in Ultrahigh Vacuum
࠘◂✪ゝ⏤࠙
ᖳᗐࡢ௧ୖࡡ㡧┘࡞ࡗ࠷࡙ᐁ᪃ࡌࡾᏽ࡚࠷ࡾࠊ
㸝1㸞 ㉰㧏⣟ᗐ
๑ᖳᗐ࡞ᘤࡀ⤾ࡀࠉFe ࡡ⣟㔘ᒌࡼࡦ࡞⛸ྙ㔘࡞࠽࠷࡙ࠉ㧏࿔ἴᾃ㐗ᖈ⁈⼝⢥㘈࡞ࡻ
ࡾࠔ㉰ࠍ㧏⣟ᗐ㔘ᒌࠕࡡモష࡞ᣦᡋࡌࡾࠊ 㸝2㸞 ᴗ᚜㔖ᏽ㔖
㛜Ⓠࡊ࡙ࡀࡒ⣟∸ඔ⣪ࡡ0.1ppm (100ng/g)ฦᯊᢇ⾙ࢅᚺ⏕ࡊ࡙ࠉ㉰ࠍ㧏⣟ᗐࡊࡒFe࡞ྱࡱ
ࡿࡾᴗ᚜㔖⣟∸ඔ⣪ࡡᏽ㔖࡞ᣦᡋࡌࡾࠊ๑ᖳᗐ࡞ᘤࡀ⤾ࡀࠉ㉰ࠍ㧏⣟ᗐ㕪࡛ᴗ᚜㔖ᏽ㔖ᢇ⾙
ࡡ☔❟ࢅ᥆㐅ࡌࡾࠊ 㸝3㸞 ≁ᛮよ᪺
๑ᖳᗐ࡞ᘤࡀ⤾ࡀࠉ㹷㧏⣟ᗐFe-Cr⣌ྙ㔘ࡡࢪࣅࢿ࣭ࢱࣜฦよ࡞࠽ࡄࡾᵋ㏸ንࠕࠉࠔ㉰㧏⣟ᗐࡡ 㧏㏷ሣᛮንᙟ࡞ཀྵࡌ⣟ᗐࡡຝᯕࠕࠉࠔ㧏ᘿງ㗨ࡡ≁ᛮ࡞ཀྵࡌỀ⣪ࡡᙫ㡢ࠕࠉࠔFe-Cr⣌ྙ㔘ࡡỀ
⣪ㄇ㉫ࡿវུᛮࠕࠉࠔFe-Cr⣌ྙ㔘ࡡᚺງ⭁㣏ࡿࠕ࠽ࡻࡦ㹷Feࡡᴗ᚜㔖⣟∸ᏽ㔖㹸࡞㛭ࡌࡾ
◂✪ࢅࡈࡼ࡞᥆㐅ࡌࡾࠊ
㸣
㔘ᒌ࢝ࣚࢪ࣬↋ᶭᮞᩩྙ㛜Ⓠභྜྷ◂✪ࣈࣞࢩ࢘ࢠࢹ
ࣈࣞࢩ࢘ࢠࢹ࣭ࣛࢱ࣭࣬ᩅ㸝㸞
୕ ᪺
㸝㹳㸞࠘ᵋᠺဤ࠙
ࣈࣞࢩ࢘ࢠࢹ࣭ࣛࢱ࣭࣬ᩅ㸝㸞㸯୕᪺㸤ຐᩅ㸯ᘿࠉ⚗ཋᖷኰࠉ୯ᒜᖶொࠉ
ࣜࢫ࢞ࣤࢺ࣐ࢹࣛࣁࣝࣤࢲࢿࣥࢴࢲ㸤ຐᡥ㸯㛭ୌ㑳ࠉQUANG Jianbingࠉ⏛ᮟ㈶ࠉㅨᅗᙁ
≁ืᩅ⫩◂✪ᩅဤ㸯ZHANG QinghengࠉHUA Qianࠉ⛑㢴㤮ࠉZHU Shengli㸤ᐂဤᩅ㸯⋜᩺ᨼ ᩅຸఫဤ㸯ᕖᔪ᭽㸤ᢇ⬗ఫဤ㹐1ྞ㹒㸤ຸఫဤ㹐4ྞ㹒
࠘◂✪ᠺᯕ࠙
ᖲᠺ17ᖳᗐࡢ᮶ᕝኬࡡᚺ⏕ࢬ࣐ࣚࢴࢠࢪ◂✪ᡜࠉኬ㜨ኬᏕࡡྙ⛁Ꮥ◂✪ᡜ࡛㏻ᦘ࡚ࠔ㔘ᒌ࢝ࣚࢪ࣬
↋ᶭᮞᩩྙ㛜Ⓠ༝ྜྷ◂✪ࣈࣞࢩ࢘ࢠࢹࠕࢪࢰ࣭ࢹࡊࡒᖳࡡ࡚ࠉኬᏕࡡ㏻ᦘ◂✪ࡢ┘ୖᙁງ࡞
㐅⾔୯࡚࠵ࡾࠊᚉࡖ࡙ࠉᖲᠺ17ᖳᗐࡢ㔘◂୯ᚨࡡ㔘ᒌ࢝ࣚࢪࡡ⿿࡛ᵋ㏸よᯊ◂✪ࡡ୯ᚨ࡚࠵ࡖࡒࠊ
Ref. 1 Formation ranges of icosahedral, amorphous and crystalline phases in rapidly solidi.ed Ti-Zr-Hf-Ni alloys, N. Chen a,b, D.V. Louzguine b, S. Ranganathan c, A. Inoue b
Acta Mater.,53(2005)759-764.
a Department of Materials Science, Graduate School, Tohoku University, Sendai 980-8577, Japan
b Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
c Department of Metallurgy, Indian Institute of Science, Bangalore 560 012, India Abstract
From the quaternary Ti-Zr-Hf-Ni phase diagram, the cross-section at 20 at.% Ni was selected for investigation. The icosahedral quasicrystalline, crystalline and amorphous phases were observed to form in nine kinds of rapidly solidified (TixZryHfz)80Ni20(x + y + z = 1) alloys at different compositions. The quasilattice constants of 0.519 and 0.531 nm were obtained for the icosahedral phase formed in the melt-spun Ti40Zr20Hf20Ni20 and Ti20Zr40Hf20Ni20 alloys, respectively.
The icosahedral phase formed in the melt-spun Ti40Zr20Hf20Ni20 alloy especially is thermodynamically stable. The supercooled liquid region of the Ti20Zr20Hf40Ni20 glassy alloy reached 64 K. From these results a comparison of quasicrystal-forming and glass-forming abilities was carried out. The quasicrystal-forming ability was reduced and glass-forming ability was improved with an increase in Hf and Zr contents in the (TixZryHfz)80Ni20 alloys. On the other hand, an increase in Ti content caused an improvement in quasicrystal-forming ability.
Ref. 2 In situ x-ray diffraction and calorimetric studies of devitrification process in Cu-based bulk glassy alloys
Appl.Phys.Lett.,86,(2005)041906-1-3.
Dmitri V. Louzguine a and Akihisa Inoue a, Alain Reza Yavari b
a Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
b Institut National Polytechnique de Grenoble, BP 75, 38402 St-Martin-d’Heres Campus, France
Abstract
The present work is devoted to an investigation of the formation of the nanoscale icosahedral phase in Cu55Zr30Ti10Pd5 and Cu50Zr30Ti10Pd10 bulk glassy alloys by synchrotron x-ray radiation. Calculations based on the x-ray and selected-area electron diffraction patterns indicate that this phase has a high degree of icosahedral order. Kinetics of the devitrification of Cu55Zr30Ti10Pd5 is also studied in detail.
Ref. 3 Composition and structure of Cu-based nanoicosahedral phase in Cu-Zr-Ti-Pd alloy Appl.Phys.Lett.,87(2005) 211918.
D. V. Louzguine-Luzgin a, A. Inoue a,D. Nagahama b and K. Hono b
a Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
b National Institute for Materials Science 1-2-1 Sengen, Tsukuba 305-0047, Japan Abstract
The present work is devoted to an investigation of the composition of a nanoscale icosahedral phase in a Cu55Zr30Ti10Pd5 glassy alloy by three-dimensional atom probe analysis. The data indicate that the composition of the nanoicosahedral phase that precipitates from the Cu55Zr30Ti10Pd5 glassy alloy is not much different from that of the matrix, that is, the icosahedral phase is Cu-based containing more than 50 at. % Cu. The formation criteria for Cu- and Zr/Hf-based icosahedral phases are
discussed based on quasi-lattice constant derived from average atomic diameter ratio.
Ref. 4 Glass Formation, Corrosion Behavior and mechanical properties of Bulk Glassy Cu-Hf-Ti-Ta Alloys
Acat Mater, 53 (2005), 3903-3911
C. Qin a, W. Zhang a, K.Asami a, N. Ohtsu, and A. Inoue a,
a Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
Abstract
Bulk glassy (Cu0.6Hf0.25Ti0.15)100xNbx (x =0.8 at.%) alloys with maximum diameters of 2.5*4 mm were produced by copper mold casting. The corrosion rates in 1 N HCl and 3 mass% NaCl solutions significantly decrease with an increase in Nb content. The 6 at.% Nb alloy shows distinct spontaneous passive region in the HCl solution. The alloys with a larger amount of Nb are spontaneously passivated with lower passive current densities and higher pitting corrosion potentials in the NaCl solution. X-ray photo
electron spectroscopy analysis revealed that the formation of Hf-, Nb- and Ti-enriched surface film on the alloys could be responsible for the high corrosion resistance of the Cu-Hf-Ti-Nb alloys in HCl and NaCl solutions. Youngs modulus, compressive fracture strength and compressive plastic strain are 130 GPa, 2405 MPa and 2.8%, respectively, for the 4 at.% Nb alloy, 126 GPa,2305 MPa and 2.1%, respectively, for the 8 at.% Nb alloy.
Ref. 5 Unusual room-temperature compressive plasticity in nanocrystal-toughened bulk copper-zirconium glass,
Philosophical Magazine Letters. 85 (2005), 221 - 229
A. Inoue a, W. Zhang a, T. Tsurui a, A. R. Yavari b & A. L. Greer c,
a Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
b Institut National Polytechnique de Grenoble, BP 75, 38402 St-Martin-d’Heres Campus, France
c University of Cambridge, Pembroke St.,Cambridge, CB2 3QZ UK Abstract
Cast Cu50Zr50 alloy rods with a diameter of 1mm have been found to consist of a glassy phase containing fine crystalline particles with a size of about 5 nm. They have a glass transition temperature Tg of 675 K, and a large supercooled-liquid region extending 57 K above Tg. The rods exhibit a high yield strength of1860 MPa and a Young’s modulus of 104 GPa. Because they contain adispersion of embedded nanocrystals, the as-cast bulk metallic glass rods cansustain a compressive plastic strain at room temperature of more than 50%, an exceptional value which is explicable by compensation of any shear softening by nanocrystal coalescence and pinning of shear bands.
࠘さ㸪ᩝ⊡࠙
1. D.V.Louzguine, A.R.Yavari and A.Inoue, In situ X-ray diffraction and calorimetric studies of devitrification process in Cu-based bulk glassy alloys,
Appl.Phys.Lett.,86,(2005)041906-1-3.
2. D.V.Louzguine-Luzgine,A.Inoue,D.Nagahama and K.Hono, Composition and structure of Cu-based nanoicosahedral phase in Cu-Zr-Ti-Pd alloy,Appl.Phys.Lett.,87(2005) 211918.
3. N.Chen,D.V.Louzguine,S.Ranganathan and A.Inoue,Formation ranges oficosahedral, amorphous and crystal phases in rapidly solidified Ti-Zr-Hf-Ni alloys,
Acta Mater.,53(2005)759-764.
4. C. Qin, W. Zhang, K.Asami, N. Ohtsu, and A. Inoue,
Glass Formation, Corrosion Behavior and mechanical properties of Bulk Glassy Cu-Hf-Ti-Ta Alloys, Acta
Mater, 53 (2005), 3903-3911
5. A. Inoue, W. Zhang, T. Tsurui, A. R. Yavari & A. L. Greer, Unusual room- temperature compressive plasticity in nanocrystal-toughened bulk copper- zirconium glass,
Philosophical Magazine Letters. 85 (2005),221-229.
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