Scholarlink

<p>Previous studies have shown that magnesium (Mg) tends to form a halo-like distribution around graphite nodules in slowly cooled castings. In this study, the Mg distribution in a rapidly cooled cast sample—exhibiting a mixed structure of ledeburite (chill) and graphite nodules—was examined using an electron probe microanalyzer (EPMA). Prior to EPMA analysis, the sample was analyzed using an optical emission spectrometer to quantify both free and inclusion-bound Mg. Two surface preparation methods were compared for EPMA: hand polishing with diamond paste and focused ion beam (FIB) milling. In both cases, Mg segregation was observed at voids and throughout the cross sections of spheroidal graphite nodules. These findings are discussed in relation to the chemical behavior of Mg and the formation mechanism of spheroidal graphite (SG). A revised interpretation of the Mg halo formation is proposed, accompanied by a schematic illustration. The "site theory" for graphite spheroidization, originally proposed by the author in 1996, is further developed in light of these results.</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

Magnesium Morphology in Chill Sample Castings Used for Spectrometer Analysis

  • 期刊论文

  • 发表日期：

    2025年9月23日

查看全文
  • Haruki Itofuji,
  • Masayuki Itamura

摘要

Previous studies have shown that magnesium (Mg) tends to form a halo-like distribution around graphite nodules in slowly cooled castings. In this study, the Mg distribution in a rapidly cooled cast sample—exhibiting a mixed structure of ledeburite (chill) and graphite nodules—was examined using an electron probe microanalyzer (EPMA). Prior to EPMA analysis, the sample was analyzed using an optical emission spectrometer to quantify both free and inclusion-bound Mg. Two surface preparation methods were compared for EPMA: hand polishing with diamond paste and focused ion beam (FIB) milling. In both cases, Mg segregation was observed at voids and throughout the cross sections of spheroidal graphite nodules. These findings are discussed in relation to the chemical behavior of Mg and the formation mechanism of spheroidal graphite (SG). A revised interpretation of the Mg halo formation is proposed, accompanied by a schematic illustration. The "site theory" for graphite spheroidization, originally proposed by the author in 1996, is further developed in light of these results.