Thermodynamic Interpretation of the Martensitic Transformation in Ultrafine γ-Fe(N) Particles

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概要

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• Face centered cubic (fcc) γ-Fe (5.9-10.4 at.%N) ultrafine particles ranging in size from 30 to 10O nm were prepared at room temperature by laser induced pyrolysis of Fe(CO)_5 and NH_3. It is found that these austenitic particles did not transform to rnartensite when subsequently quenched to 77 K or 4.2 K, which is greatly lower than the martensite-start temperature of the bulk alloy with the same composition. Many planar defects, which can serve as the favorable martensitic nucleation sites in bulk austenite alloy, have been observed in these particles. Taking into account the size effect of the ultrafine particles on the martensitic transformation, a modification for the conventional martensitic transformation has been made to interpret the stabilization behavior of the ultrafine γ-Fe(N) particles. It is indicated that the strengthening of the particles due to the reduction of the particle size and refinement of grain size may play important roles in both inhibiting the homogeneous nucleation and martensitic transformation occurred in the ultrafine particles.

• 社団法人応用物理学会の論文
• 1996-08-15

著者

• Liu B

  Tsinghua Univ. Beijing Chn

• Liu Baixin

  Department Of Materials Science And Engineering Tsinghua University

• Hu Zhuangqi

  Department Of Materials Science And Engineering Tsinghua University

• ZAHO Xinqing

  National Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences

• LIANG Yong

  National Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences

• Liang Yong

  National Laboratory For Rsa Institute Of Metal Research Chinese Academy Of Sciences

• Zaho Xinqing

  National Laboratory For Rsa Institute Of Metal Research Chinese Academy Of Sciences:department Of Ma

• Zhao Xinqing

  National Laboratory for RSA, Institute of Metal Research, Chinese Academy of Sciences

• LIU Baixin

  Department of Materials Science and Engineering, Tsinghua University

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