Mg-Y-Zn 系 LPSO 構造中の積層欠陥への添加元素の偏析挙動の熱力学的解析

• 梅林 樹

  九州工業大学大学院工学府

• 飯久保 智

  九州工業大学大学院生命体工学研究科

• 大谷 博司

  東北大学多元物質科学研究所

書誌事項

タイトル別名

• Thermodynamic Analysis on a Segregation Behavior of Alloying Elements to Stacking Faults in Mg-Y-Zn Based LPSO Structures
• Mg-Y-Znケイ LPSO コウゾウ チュウ ノ セキソウ ケッカン エ ノ テンカ ゲンソ ノ ヘンセキキョドウ ノ ネツ リキガクテキ カイセキ

抄録

  A long period stacking ordered (LPSO) structure in Mg-based alloys is characterized by the periodical arrangement of stacking faults introduced to hcp matrix lattice. Alloying elements of rare earth atoms and transition metal atoms segregate to the stacking faults (SFs) and form chemically ordered structures in the layers. The atomic arrangement of matrix phase and SF layer in the LPSO structures corresponds to those in hcp and fcc structures, respectively. Thus in the present work, the free energies for the hcp and fcc phases in the Mg-Y-Zn ternary system obtained from the first-principles calculations combined with the cluster variation method were introduced to the CALPHAD method. Segregation coefficients between hcp matrix and fcc SF were calculated applying the parallel tangent law. The calculated results showed that the Y and Zn atoms segregate to the SFs, mainly because of the difference in chemical potentials for each element between fcc and hcp.<br>

収録刊行物

• 日本金属学会誌

  日本金属学会誌 78 (3), 117-125, 2014

  公益社団法人 日本金属学会

キーワード

• segregation
• long period stacking ordered (LPSO) structures
• thermodynamic analysis
• stacking faults

詳細情報

• CRID: 1390282681458164352
• NII論文ID: 40020008586
• NII論文ID: 130004456417
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet.jbw201307
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 025325704
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025325704
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/78/3/78_JBW201307/_pdf
• 本文言語コード: ja
• データソース種別:
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