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Evaluation of compressive deformation behavior of Zr$$_{55}$$Al$$_{10}$$Ni$$_{5}$$Cu$$_{30}$$ bulk metallic glass containing ZrC particles by synchrotron X-ray diffraction

放射光X線回折によるZrC粒子分散型Zr$$_{55}$$Al$$_{10}$$Ni$$_{5}$$Cu$$_{30}$$バルク金属ガラスの圧縮変形挙動評価

鈴木 裕士; 才田 淳治*; 菖蒲 敬久; 勝山 仁哉; 加藤 秀実*; 今福 宗行*; 佐藤 成男*

Suzuki, Hiroshi; Saida, Junji*; Shobu, Takahisa; Katsuyama, Jinya; Kato, Hidemi*; Imafuku, Muneyuki*; Sato, Shigeo*

10vol.%ZrC粒子分散Zr$$_{55}$$Al$$_{10}$$Ni$$_{5}$$Cu$$_{30}$$四元系金属ガラスについて、圧縮変形させた試験片内部のZrC相及び金属ガラス相の残留ひずみを放射光X線により測定するとともに、有限要素解析によりZrC粒子周辺の局所的な塑性変形挙動を評価することによって、その圧縮変形メカニズムを評価した。その結果、変形初期においては、粒子周囲に局所的な塑性変形を生じるとともに、金属ガラス相が大きくひずみを負担するが、変形が進むと金属ガラス相が全体的に降伏して粒子が大きくひずみを負担、最終的には粒子が粒内破壊を生じて破断に至ることを明らかとした。

Compressive deformation mechanism of a Zr$$_{55}$$Al$$_{10}$$Ni$$_{5}$$Cu$$_{30}$$ bulk metallic glass containing 10vol.%ZrC (ZrC-BMG) was evaluated by measuring the residual strains in the compressive deformed samples using the synchrotron X-ray diffraction and also evaluating the localized deformation behavior around the ZrC particles by the finite element analysis. Phase stress shared by the metallic glass matrix was increased before macroscopic yielding due to local plastic deformation around the ZrC particles. After macroscopic yielding, the phase stress shared by the ZrC phase was drastically increased, and finally the ZrC-BMG was fractured by breaking the ZrC particles reaching its fracture strength.

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パーセンタイル:54.08

分野:Nanoscience & Nanotechnology

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