Scholarlink

<p>This study investigated the annealing temperature response of low-cost scrap-rolled Ti-6Al-4V alloy, systematically analyzing its strengthening mechanisms through optical microscopy, scanning electron microscopy, and electron backscatter diffraction. During 550-850&#xa0;°C annealing, the recrystallization-driven <i>α</i>-phase progressively evolves from lamellar to equiaxed morphology. A bimodal structure forms after annealing at 950&#xa0;°C, whereas Widmanstätten microstructure dominates at 1050&#xa0;°C. Strength exhibits continuous decline, while ductility improves initially and then deteriorates across the annealing temperature range, achieving optimal strength–plasticity balance at 850&#xa0;°C. Distinct fracture modes emerge: 1050&#xa0;°C-annealed specimens show hybrid ductile–brittle fracture morphology, contrasting with fully ductile failure in other annealed conditions. Crystallographic texture transitions from dual {0001}//RD<sub>1</sub> and {10-10}//AD components at 550-950&#xa0;°C to singular {0001}//AD orientation at 1050&#xa0;°C. During annealing at 550-850&#xa0;°C, recrystallization dominated microstructural evolution with progressive weakening of texture intensity, whereas abnormal grain growth at elevated temperatures (950-1050&#xa0;°C) enhanced texture intensity. Intragranular orientation randomization serves as the root cause of texture weakening, progressively undermining crystallographic preference dominance. Schmid factor evaluation and critical resolved shear stress analysis demonstrate prismatic  &lt; a&gt; slip dominates in AD-direction tensile deformation, assisted by pyramidal  &lt;a&gt; slip systems, with interfacial strengthening mechanisms contributing predominantly to mechanical performance enhancement.</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

Effect of Anneal Temperature on Microstructure and Mechanical Characteristics of Scrap-Rolled Ti-6Al-4V Alloy Bars

  • 期刊论文

  • 发表日期：

    2026年3月30日

查看全文
  • Peng Shao,
  • Han Xiao,
  • Siyuan Zhai,
  • Kun Liu,
  • Shuqi Deng

摘要

This study investigated the annealing temperature response of low-cost scrap-rolled Ti-6Al-4V alloy, systematically analyzing its strengthening mechanisms through optical microscopy, scanning electron microscopy, and electron backscatter diffraction. During 550-850 °C annealing, the recrystallization-driven α-phase progressively evolves from lamellar to equiaxed morphology. A bimodal structure forms after annealing at 950 °C, whereas Widmanstätten microstructure dominates at 1050 °C. Strength exhibits continuous decline, while ductility improves initially and then deteriorates across the annealing temperature range, achieving optimal strength–plasticity balance at 850 °C. Distinct fracture modes emerge: 1050 °C-annealed specimens show hybrid ductile–brittle fracture morphology, contrasting with fully ductile failure in other annealed conditions. Crystallographic texture transitions from dual {0001}//RD1 and {10-10}//AD components at 550-950 °C to singular {0001}//AD orientation at 1050 °C. During annealing at 550-850 °C, recrystallization dominated microstructural evolution with progressive weakening of texture intensity, whereas abnormal grain growth at elevated temperatures (950-1050 °C) enhanced texture intensity. Intragranular orientation randomization serves as the root cause of texture weakening, progressively undermining crystallographic preference dominance. Schmid factor evaluation and critical resolved shear stress analysis demonstrate prismatic  < a> slip dominates in AD-direction tensile deformation, assisted by pyramidal  <a> slip systems, with interfacial strengthening mechanisms contributing predominantly to mechanical performance enhancement.