Comparison and elucidation of the synchronous/non-synchronous type LPSO structures in the deformation mechanism and the principle of strengthening by observation and measurement

2015 Fiscal Year Final Research Report

• Project Area: Materials Science of synchronized LPSO structure -Innovative Development of Next-Generation Lightweight Structural Materials-
• Project/Area Number: 23109008
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyushu University
• Principal Investigator: Higashida Kenji 九州大学, 工学(系)研究科(研究院), 教授 (70156561)
• Co-Investigator(Kenkyū-buntansha): MORIKAWA Tatsuya 九州大学, 大学院工学研究院材料工学部門, 助教 (00274506) ; HAGIHARA Kohji 大阪大学, 大学院工学研究科知能・機能創成工学専攻, 准教授 (10346182) ; FUJIWARA Masami 日本大学, 工学部, 教授 (40156930)
• Co-Investigator(Renkei-kenkyūsha): SUZUKI Mayumi 富山県立大学, 工学部機械システム工学科, 准教授 (20292245)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 力学特性 / 塑性変形機構 / キンク / 変形帯 / 高温強度

Outline of Final Research Achievements

The strength of LPSO phase with kink bands introduced by plastic deformation showed twice as high as initial state. The relationship between the kink band density and strength is experimentally quantified in a temperature range from room temperature to 573K, obtaining significant results leading to the derivation of quantitative guidelines for the strengthening by kink bands. Meso-scale structural analysis such as orientation and morphology of kink bands advances, also with its geometric features, aspects of the high-speed development of the lens-shaped kink boundary by in-situ observations were captured. The large contribution of basal sliding was showed by measurement of shear strain of kink vicinity quantified by nanoscale marker. These strongly suggest the interpretation by the disclination model of kink. In addition, the origin of large flow stress of LPSO structure was clarified by the establishment of identification of high-temperature deformation mechanism.

Free Research Field

材料物性学