Scholarlink

<p>The effect of a&#xa0;two-phase (B2+γ/γ′)-structure on the corrosion rate is studied in single crystals of the CoNiAl and CoNiAlFe ferromagnetic shape memory alloys. It is shown that the smaller the volume fraction of the secondary γ/γ′-phases, the lower the corrosion rate. It is found out that the Co<sub>35</sub>Ni<sub>35</sub>Al<sub>30</sub> and Co<sub>35</sub>Ni<sub>35</sub>Al<sub>28</sub>Fe<sub>2</sub> single crystals with small volume fractions of γ/γ′-phases have a&#xa0;lower corrosion rate, <i>C</i><sub>corr</sub> = 1.20–1.86∙10<sup>−3</sup> mm/year, compared to that of the Co<sub>40</sub>Ni<sub>33</sub>Al<sub>27</sub> and Co<sub>39</sub>Ni<sub>32</sub>Al<sub>27</sub>Fe<sub>2</sub> single crystals with a&#xa0;large volume fraction of the secondary phases (<i>C</i><sub>corr</sub> = 1.83–2.98∙10<sup>−3</sup> mm/year). This is achieved due to a&#xa0;short length of the interphase B2-γ/γ′-boundary and Fe alloying. The crystals under study demonstrate pitting and intercrystalline corrosion.</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

Study of corrosion resistance of two-phase CoNiAl(Fe) single crystals

  • 期刊论文

  • 发表日期：

    2025年5月1日

查看全文
  • A. S. Eftifeeva,
  • E. A. Bolshevich,
  • S. G. Anikeev,
  • E. I. Yanushonite,
  • E. Yu. Panchenko,
  • Yu. I. Chumlyakov

摘要

The effect of a two-phase (B2+γ/γ′)-structure on the corrosion rate is studied in single crystals of the CoNiAl and CoNiAlFe ferromagnetic shape memory alloys. It is shown that the smaller the volume fraction of the secondary γ/γ′-phases, the lower the corrosion rate. It is found out that the Co35Ni35Al30 and Co35Ni35Al28Fe2 single crystals with small volume fractions of γ/γ′-phases have a lower corrosion rate, Ccorr = 1.20–1.86∙10−3 mm/year, compared to that of the Co40Ni33Al27 and Co39Ni32Al27Fe2 single crystals with a large volume fraction of the secondary phases (Ccorr = 1.83–2.98∙10−3 mm/year). This is achieved due to a short length of the interphase B2-γ/γ′-boundary and Fe alloying. The crystals under study demonstrate pitting and intercrystalline corrosion.