Scholarlink

<p>Thermal deformation and recrystallization behavior of extruded 2195 Al-Li alloy, prepared by rapid solidification, were studied through isothermal compression experiments conducted at strain rate ranging from 0.01 to 10&#xa0;s<sup>−1</sup> temperature ranging from 380 to 500&#xa0;°C. By considering strain compensation and processing map based on the Arrhenius constitutive equation, the optimal processing temperature and strain rate for the alloy are determined as 450-500&#xa0;°C and 0.01-0.1&#xa0;s<sup>−1</sup>, respectively. Moreover, the activation energy of the 2195 alloy is found to be significantly lower (200.42&#xa0;kJ/mol) compared to other alloys prepared by different methods, indicating its excellent hot workability. Microstructural observations show that three mechanisms of dynamic recrystallization during the thermal deformation: discontinuous dynamic recrystallization (DDRX), continuous dynamic recrystallization (CDRX), and geometric dynamic recrystallization (GDRX). Furthermore, it is observed that the nucleation mechanism and evolution of dynamic recrystallization (DRX) are influenced by the value of ln Z parameter in the Zerner-Hollomont model. The alloy predominantly undergoes DDRX at high ln Z values (&gt; 65.74), GDRX at moderate ln Z values (57.4 &gt; ln Z &gt; 50.1), and DRV and CDRX at low ln Z values (&lt; 43.61).</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

Thermal Deformation and Recrystallization Behavior of Extruded Rapid Solidification Powder Metallurgy 2195 Al-Li Alloy

  • 期刊论文

  • 发表日期：

    2025年3月31日

查看全文
  • Xinxing Li,
  • Richu Wang,
  • Xiang Peng,
  • Zhiyong Cai,
  • Pinhui Lv,
  • Shuaijiang Yan

摘要

Thermal deformation and recrystallization behavior of extruded 2195 Al-Li alloy, prepared by rapid solidification, were studied through isothermal compression experiments conducted at strain rate ranging from 0.01 to 10 s−1 temperature ranging from 380 to 500 °C. By considering strain compensation and processing map based on the Arrhenius constitutive equation, the optimal processing temperature and strain rate for the alloy are determined as 450-500 °C and 0.01-0.1 s−1, respectively. Moreover, the activation energy of the 2195 alloy is found to be significantly lower (200.42 kJ/mol) compared to other alloys prepared by different methods, indicating its excellent hot workability. Microstructural observations show that three mechanisms of dynamic recrystallization during the thermal deformation: discontinuous dynamic recrystallization (DDRX), continuous dynamic recrystallization (CDRX), and geometric dynamic recrystallization (GDRX). Furthermore, it is observed that the nucleation mechanism and evolution of dynamic recrystallization (DRX) are influenced by the value of ln Z parameter in the Zerner-Hollomont model. The alloy predominantly undergoes DDRX at high ln Z values (> 65.74), GDRX at moderate ln Z values (57.4 > ln Z > 50.1), and DRV and CDRX at low ln Z values (< 43.61).