{"created":"2023-06-20T15:11:26.405694+00:00","id":41094,"links":{},"metadata":{"_buckets":{"deposit":"5910af80-1583-4f70-99d4-3ff67ece19d4"},"_deposit":{"created_by":1,"id":"41094","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"41094"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00041094","sets":["1887:1893","1896:1898:1933:1934"]},"author_link":["501535","501536","501537","501534"],"item_3_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Study on solidification of eutectic system alloys in space"}]},"item_3_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1994-10-20","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"920","bibliographicPageStart":"894","bibliographic_titles":[{"bibliographic_title":"宇宙開発事業団技術報告"},{"bibliographic_title":"NASDA Technical Memorandum","bibliographic_titleLang":"en"}]}]},"item_3_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本研究の目的は無重力条件下でアルミニウム-銅(Al-Cu)共晶系合金の溶解および凝固を行い、この合金の凝固メカニズムを明らかにすることである。とくに無重力の無対流の条件下において、共晶系合金の初晶の核生成が融液内部で起こるのか、あるいは容器壁面と接した外周部で起こるのかを明らかにすることは、長年の間、未解決であった凝固組織に現れる等軸晶(自由晶)の生成メカニズムの解明が期待でき、さらに共晶系合金の凝固理論の確立のためにも大きな意義がある。実験に使用した合金試料は亜共晶組成のAl-32.4mass%Cuを4個(うち2個は表面に酸化皮膜を着けて、凝固組織に及ぼすマランゴニ対流の影響を調べる)および過共晶組成のAl-33.5mass%Cuを2個の合計6個である。これらは別々に黒鉛カプセルに入れられた後、石英ガラスアンプルに真空封入され、さらにタンタルカートリッジに入れられた。試料の溶解凝固はスペースシャトル･エンデバー号に搭載された連続加熱型電気炉(CHF)により、宇宙空間の軌道上で700度C、5分間溶解保持後、冷却された。地上に回収された試料は外観検査の後、組織観察を行った。試料の凝固組織の観察を行った結果、亜共晶Al-32.4mass%Cu合金では、初晶αアルミニウムデンドライトはカプセルと接した外周部で核生成されたあと、内部に向かって連続的に成長した様子が観察された。また共晶ラメラーは自由凝固が行われたために、方向性のない組織となった。マランゴニ対流防止のために着けられた酸化皮膜の組織に及ぼす影響は皮膜を着けなかったものと比較してとくに違いはなかった。皮膜を着けなかった試料も、アンプル内の残留酸素により表面にごく薄い酸化皮膜が生成されていたことから、すべての試料において、酸化皮膜が表面を被ったために、融液の自由表面は生成されず、その結果マランゴニ対流は発生しなかったと考えられる。過共晶組成Al-33.5mass%Cu合金においても、初晶CuAl2が試料外周部で核生成して、そこから内部に連続的に成長している様子が観察された。また、過共晶組成では局部的に亜共晶側で晶出するはずのαアルミニウムデンドライトが認められた。さらに共晶ラメラーは方向性のないものであった。各試料の外周部には数個から10数個の小さい気泡が、また内部にはまれに大きな気泡が存在した。この成因はおもに黒鉛カプセルに吸収されていた空気が加熱時に放出されて、融液に吸収され、凝固時に気泡を形成したが、無重力のために移動ができずに生成位置に留まったものと考えられる。本研究の結果から、対流の起こらない無重力条件下では、融液内での初晶の核生成は認められなかった。このことから、本研究者の提唱した対流の存在下で生成される等軸晶としての初晶の生成メカニズム｢結晶遊離理論｣が立証できた。","subitem_description_type":"Abstract"}]},"item_3_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"The aim of this study is to manifest the solidification mechanism of Al-Cu eutectic system alloy by melting and solidifying the alloy under microgravity. Especially, it is very important for elucidation of unresolved formation mechanism of the cubic system (free crystal system) appearing in solidified structures under microgravity as well as establishment of the solidification theory of eutectic system alloys to make clear where the nucleation of primary crystal in eutectic system alloys is generated at inside of the melts or at outer region contacting to the container wall. The alloy samples used in the experiments are six in total. The details are four hypo-eutectic Al-32.5 mass percent Cu alloys (two of them are provided with oxide film on the surface prior to the experiments and are investigated the effects of Marangoni convection on solidified structures) and 2 hyper-eutectic Al-33.5 mass percent Cu alloys. After they were separately contained in a graphite capsule, they were vacuum sealed in a silica glass ample and then were put in a tantalum made cartridge. The samples were melted by Continuous Heating Furnace (CHF) boarded on the space shuttle 'Endeavour' on the orbit at 700 C, and after the melted state was maintained for 5 minutes, they were cooled. After inspection of aspect of the recovered samples had been conducted, the structures of the samples were observed. It was found out from observation of solidified structures of the samples that in hypo-eutectic Al-32.4 mass percent Cu alloy, nucleation of primary crystal alpha-aluminium dendrite was formed at outer region contacting to the capsule and then the crystal growth was successively developed toward inside of the melts. Moreover, the eutectic lamellar became the structure without direction as result of free solidification. The oxide film coated for preventing from Marangoni convection did not almost effect on the structure. Considering that extreme thin oxide film was formed on the surface of the samples with no oxide film by residual oxygen in an ample, it was guessed that Marangoni convection was not generated because of no formation of free surface of melts due to covering the surface of any samples with oxide film. Also, in hyper-eutectic Al-33.5 mass percent Cu alloy, it was observed that nucleation of primary crystal CuAl2 was developed at outer region of the samples, and from there the nucleation was successively extended toward inside. Moreover, alpha-aluminium dendrite to be locally crystallized at the side of hypo-eutectic system was observed in hyper-eutectic composition. Further, eutectic lamellar had no direction. There were from several to ten and several small bubbles around outer region of each sample and exceptionally big bubbles in inside of sample. The main cause of formation of the confined bubbles is probably guessed that they can not move because of microgravity and stay at initially formed position, although the air bubbles are formed during solidification by release of air previously captured in a graphite capsule at the time of heating and then by absorption to melts. It was manifested from this study that nucleation of primary crystal in melts was not confirmed under microgravity with no convection. It can be concluded from above results that the crystal free theory has been demonstrated which is the formation theory of primary crystal as cubic system formed under convection environment proposed by the authors.","subitem_description_type":"Other"}]},"item_3_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0004116020","subitem_description_type":"Other"}]},"item_3_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: NASDA-TMR-940002 V.2","subitem_description_type":"Other"}]},"item_3_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙開発事業団"}]},"item_3_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"National Space Development Agency of Japan (NASDA)"}]},"item_3_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1345-7888","subitem_source_identifier_type":"ISSN"}]},"item_3_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00364784","subitem_source_identifier_type":"NCID"}]},"item_3_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"千葉工業大学"},{"subitem_text_value":"千葉工業大学"}]},"item_3_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Chiba Institute of Technology"},{"subitem_text_language":"en","subitem_text_value":"Chiba Institute of Technology"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"大野, 篤美"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"茂木, 徹一"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Ono, Atsumi","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Motegi, Tetsuichi","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-02-10"}],"displaytype":"detail","filename":"04116020.pdf","filesize":[{"value":"2.8 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"04116020.pdf","url":"https://jaxa.repo.nii.ac.jp/record/41094/files/04116020.pdf"},"version_id":"59353fff-fd7f-4f4c-9fb6-4516009325a5"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"微小重力","subitem_subject_scheme":"Other"},{"subitem_subject":"共晶系合金","subitem_subject_scheme":"Other"},{"subitem_subject":"凝固","subitem_subject_scheme":"Other"},{"subitem_subject":"Al-Cu合金","subitem_subject_scheme":"Other"},{"subitem_subject":"無対流","subitem_subject_scheme":"Other"},{"subitem_subject":"核生成","subitem_subject_scheme":"Other"},{"subitem_subject":"融液","subitem_subject_scheme":"Other"},{"subitem_subject":"容器壁面","subitem_subject_scheme":"Other"},{"subitem_subject":"凝固組織","subitem_subject_scheme":"Other"},{"subitem_subject":"等軸晶","subitem_subject_scheme":"Other"},{"subitem_subject":"マランゴニ対流","subitem_subject_scheme":"Other"},{"subitem_subject":"組織観察","subitem_subject_scheme":"Other"},{"subitem_subject":"外観検査","subitem_subject_scheme":"Other"},{"subitem_subject":"亜共晶合金","subitem_subject_scheme":"Other"},{"subitem_subject":"結晶成長","subitem_subject_scheme":"Other"},{"subitem_subject":"microgravity","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"eutectic alloy","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"solidification","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Al Cu alloy","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"no convection","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"nucleation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"melt","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"container wall","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"solidification structure","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"cubic system","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Marangoni convection","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"structure observation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"visual inspection","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"hypoeutectic alloy","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"crystal growth","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"technical report","resourceuri":"http://purl.org/coar/resource_type/c_18gh"}]},"item_title":"無重力条件下における共晶系合金の凝固に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"無重力条件下における共晶系合金の凝固に関する研究"}]},"item_type_id":"3","owner":"1","path":["1893","1934"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"41094","relation_version_is_last":true,"title":["無重力条件下における共晶系合金の凝固に関する研究"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-20T20:26:53.014620+00:00"}