Scholarlink

<p>A chromium-silicon mixture of the CrSi<sub>2</sub> atomic composition is subjected to mechanical activation in a high-energy planetary mill for 9–60 min at a ball to material ratio of 20 : 1. Silicide formation during mechanical activation begins already after 9 min of milling, and only the highest silicide CrSi<sub>2</sub> is observed up to 60 min. During the milling, a roll-shaped structure is formed from alternating layers of Cr and Si, which become thinner with increasing activation time, reaching the diffusion path lengths of each other’s components in some places. With subsequent rapid (~6°C/s) heating of the activated mixtures to a temperature of 1000°C, starting from a milling time of 45 min, a state close to phase equilibrium is established, in which the content of CrSi<sub>2</sub> is maximal, but CrSi, Cr<sub>5</sub>Si<sub>3</sub>, and Si are also present (up to 10% in total). The diffusion nature of silicide formation is confirmed both during mechanical synthesis and during subsequent rapid heating. In this case, the observation of only one highest silicide CrSi<sub>2</sub> during milling is probably due to the abnormally large coefficient of interdiffusion of components in this silicide at low temperatures compared to other silicides, the layers of which in the “diffusion pie” are significantly thinner and are not detected in X-ray diffraction analysis.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Phase Formation in Cr–Si Mixture during Mechanical Activation and Annealing

  • 期刊论文

  • 发表日期：

    2025年8月2日

查看全文
  • O. N. Pripisnov,
  • E. V. Shelekhov,
  • S. I. Rupasov,
  • A. S. Medvedev

摘要

A chromium-silicon mixture of the CrSi2 atomic composition is subjected to mechanical activation in a high-energy planetary mill for 9–60 min at a ball to material ratio of 20 : 1. Silicide formation during mechanical activation begins already after 9 min of milling, and only the highest silicide CrSi2 is observed up to 60 min. During the milling, a roll-shaped structure is formed from alternating layers of Cr and Si, which become thinner with increasing activation time, reaching the diffusion path lengths of each other’s components in some places. With subsequent rapid (~6°C/s) heating of the activated mixtures to a temperature of 1000°C, starting from a milling time of 45 min, a state close to phase equilibrium is established, in which the content of CrSi2 is maximal, but CrSi, Cr5Si3, and Si are also present (up to 10% in total). The diffusion nature of silicide formation is confirmed both during mechanical synthesis and during subsequent rapid heating. In this case, the observation of only one highest silicide CrSi2 during milling is probably due to the abnormally large coefficient of interdiffusion of components in this silicide at low temperatures compared to other silicides, the layers of which in the “diffusion pie” are significantly thinner and are not detected in X-ray diffraction analysis.