Development of High-Performance Thermoelectric Materials through Grain Refinement and Texture Enhancement

• Project/Area Number: 25630330
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Kyushu University
• Principal Investigator: HORITA Zenji 九州大学, 工学(系)研究科(研究院), 教授 (20173643)
• Co-Investigator(Renkei-kenkyūsha): MUNETO Shinji (20380587)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 熱電材料 / Bi-Te系 / 超微細結晶粒 / 電気伝導率 / 熱伝導率 / 巨大ひずみ加工 / 結晶・組織制御

Outline of Final Research Achievements

High-pressure sliding (HPS) was successfully applied to Bi2Te3 thermoelectric materials so that the grain size was significantly reduced and the crystal orientation was continuously developed. Maximum power factor increased with sliding distance for both n-type and p-type materials, especially the value achieved in the n-type was the highest ever reported. It was shown that HPS was a potential process for producing high-performance Bi2Te3 thermoelectric materials.

Research Products

• [Journal Article] Strengthening of AA7075 alloy by processing with high-pressure sliding (HPS) and subsequent aging (2015)
  • Author(s): S. Lee, K. Tazoe, I. F. Mohamed, Z. Horita
  • Journal Title: Materials Science and Engineering A Volume: 628 Pages: 56-61
  • DOI: 10.1016/j.msea.2015.01.026
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] High-pressure torsion for fabrication of high-strength and high-electrical conductivity Al micro-wires (2014)
  • Author(s): J. M. Cubero-Sesin, H. In, M. Arita, H. Iwaoka and Z. Horita
  • Journal Title: Journal of Materials Science Volume: 49 Issue: 19 Pages: 6550-6557
  • DOI: 10.1007/s10853-014-8240-1
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Thermal conductivity reduction of crystalline silicon by high-pressure torsion (2014)
  • Author(s): Sivasankaran Harish, Mitsuru Tabara, Yoshifumi Ikoma, Zenji Horita, Yasuyuki Takata, David G. Cahill, Masamichi Kohno
  • Journal Title: Nanoscale Research Letters Volume: 9 Issue: 1 Pages: 326-326
  • DOI: 10.1186/1556-276x-9-326
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Effect of temperature on solid-state formation of bulk nanograined intermetallic Al3Ni during high-pressure torsion (2014)
  • Author(s): A. Alhamidi, K. Edalati, H. Iwaoka and Z. Horita
  • Journal Title: Philosophical Magazine Volume: 94 Issue: 9 Pages: 876-887
  • DOI: 10.1080/14786435.2013.868945
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 高圧スライド加工法による7075アルミニウム合金の結晶粒微細化と機械的特性の向上 (2014)
  • Author(s): 藤光利茂、瀧沢陽一、堀田善治
  • Organizer: 軽金属学会第127回秋期大会
  • Place of Presentation: 東京都目黒区、東京工業大学
  • Year and Date: 2014-11-15 – 2014-11-16
• [Presentation] 高圧スライド加工(HPS)を 利用したAA2024合金の結晶粒微細化と超塑性特性 (2014)
  • Author(s): 増田高大、藤光利茂、瀧沢陽一、堀田善治
  • Organizer: 軽金属学会第127回秋期大会
  • Place of Presentation: 東京都目黒区、東京工業大学
  • Year and Date: 2014-11-15 – 2014-11-16
• [Presentation] 高圧スライド加工(HPS)法によるAl 7075合金丸棒材の結晶粒超微細化と超塑性 (2014)
  • Author(s): 藤光利茂、堀田善治
  • Organizer: 日本金属学会2014年秋期(第155回)講演大会
  • Place of Presentation: 愛知県名古屋市、名古屋大学
  • Year and Date: 2014-09-24 – 2014-09-26
• [Presentation] 高圧スライド加工(HPS)を 利用 した均一微細粒マグネシウム棒材の作製 (2014)
  • Author(s): 増田高大、藤光利茂、堀田善治
  • Organizer: 日本金属学会2014年秋期(第155回)講演大会
  • Place of Presentation: 名古屋大学東山キャンパス
  • Year and Date: 2014-09-24 – 2014-09-26
• [Presentation] Production of Bulk Nanostructured Materials with Enhanced Functionality Using High-Pressure Torsion (2014)
  • Author(s): Zenji Horita
  • Organizer: XII International Conference on Nanostructured Materials (NANO 2014)
  • Place of Presentation: Lomonosov Moscow State University, Moscow, Russia
  • Year and Date: 2014-07-13 – 2014-07-18
  • Invited
• [Presentation] Severe plastic deformation for production of high electrical conductivity with enhanced mechanical strength (2013)
  • Author(s): Zenji Horita
  • Organizer: 2nd International Conference on Materials for Energy - EnMat II
  • Place of Presentation: Convention Center Karlsruhe, Germany
  • Invited