Scholarlink

<p>This work analyzes the effect of strain incompatibility at grain boundaries (GBs) on the variant selection during the stress-induced martensitic transformation (SIMT) in a Cu-Al-Be alloy. The analysis is based on in-situ observations of oligocrystalline microstructures in the central zone of a tensile sample during loading. The Schmid factor (SF) often does not determine the variant selection, and multiple martensite variants (MVs) form in most grains. A balanced SF/strain-based criterion previously developed for simple variant formation performs significantly better when combined with the analysis of the stress transformation diagram. In its refined form, it can predict almost all variants observed during multiple variant selection in a grain. The strain incompatibility at GBs is estimated by predicting the displacement field due to the SIMT for specific MVs in each grain, assuming free-standing grains, and applying this displacement to the GB coordinates. The method is applied to grains with multiple MVs, surrounded by grains that show their transformation. For variants that do not follow the Schmid criterion, it is found that the observed variants reduce incompatibility. Grains with multiple variants are seen to subdivide into a mosaic of compatible blocks, each one activating a single MVs, to increase compatibility across GBs.</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

Strain Incompatibility as the Cause for Non-Schmid Variant Selection in an Oligocrystalline Cu-Al-Be Shape Memory Alloy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月10日

查看全文
  • F. N. García-Castillo,
  • R. Schouwenaars,
  • V. Amigó,
  • R. Lechuga-Taboada,
  • F. M. Sánchez-Arévalo,
  • G. A. Lara-Rodríguez,
  • E. M. Palafox,
  • J. Cortés-Pérez

摘要

This work analyzes the effect of strain incompatibility at grain boundaries (GBs) on the variant selection during the stress-induced martensitic transformation (SIMT) in a Cu-Al-Be alloy. The analysis is based on in-situ observations of oligocrystalline microstructures in the central zone of a tensile sample during loading. The Schmid factor (SF) often does not determine the variant selection, and multiple martensite variants (MVs) form in most grains. A balanced SF/strain-based criterion previously developed for simple variant formation performs significantly better when combined with the analysis of the stress transformation diagram. In its refined form, it can predict almost all variants observed during multiple variant selection in a grain. The strain incompatibility at GBs is estimated by predicting the displacement field due to the SIMT for specific MVs in each grain, assuming free-standing grains, and applying this displacement to the GB coordinates. The method is applied to grains with multiple MVs, surrounded by grains that show their transformation. For variants that do not follow the Schmid criterion, it is found that the observed variants reduce incompatibility. Grains with multiple variants are seen to subdivide into a mosaic of compatible blocks, each one activating a single MVs, to increase compatibility across GBs.