Scholarlink

<p>In the present work, the TiB<sub>2</sub>/Al–Si–Mg–Cu–Cr composites were fabricated by mixed salts in-situ reaction method. Subsequently, the combined modification was carried out by adding different contents of rare earth (Ce+Yb), and the effects of (Ce+Yb) on the microstructure and mechanical properties of as-cast TiB<sub>2</sub>/Al–Si–Mg–Cu–Cr composites were systematically investigated. The results show that in the absence of (Ce+Yb), in-situ TiB<sub>2</sub> particles can not only refine the α-Al grains, but also impede the growth of eutectic Si, which plays a kind of refining and modifying effect. Meantime the agglomeration tendency of in-situ TiB<sub>2</sub> particles is larger, and the distribution is not homogeneous. When (Ce+Yb) was added to modify the composites, the wettability of in-situ TiB<sub>2</sub> particles and Al matrix was improved, and the agglomeration tendency was reduced, which promoted the dispersion distribution of TiB<sub>2</sub> particles. The combined modification of (Ce+Yb) and in-situ TiB<sub>2</sub> particles played a synergistic role in modifying the microstructure and enhancing the mechanical properties of the composites. When 0.4 wt% (Ce+Yb) was added, the ultimate tensile strength (UTS), yield strength (YS) and elongation (El) of the composites increased to 231.9 MPa, 151.8 MPa and 5.4%, respectively. Compared with the composites without (Ce+Yb) combined modification, the UTS, YS and El increased by 20.5%, 45.1% and 54.3%, respectively.</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

Effects of (Ce+Yb) Combined Modification on the Microstructure and Mechanical Properties of TiB2/Al–Si–Mg–Cu–Cr Composites

  • 期刊论文

  • 发表日期：

    2025年1月8日

查看全文
  • Mingkun Qiu,
  • Jinbao Li,
  • Hua Mao,
  • Yujing Lang,
  • Yanlin Pan,
  • Feng Han,
  • Xinjie Zhu,
  • Guxin Zhou,
  • Jiangwei Wang,
  • Xiaodong Du

摘要

In the present work, the TiB2/Al–Si–Mg–Cu–Cr composites were fabricated by mixed salts in-situ reaction method. Subsequently, the combined modification was carried out by adding different contents of rare earth (Ce+Yb), and the effects of (Ce+Yb) on the microstructure and mechanical properties of as-cast TiB2/Al–Si–Mg–Cu–Cr composites were systematically investigated. The results show that in the absence of (Ce+Yb), in-situ TiB2 particles can not only refine the α-Al grains, but also impede the growth of eutectic Si, which plays a kind of refining and modifying effect. Meantime the agglomeration tendency of in-situ TiB2 particles is larger, and the distribution is not homogeneous. When (Ce+Yb) was added to modify the composites, the wettability of in-situ TiB2 particles and Al matrix was improved, and the agglomeration tendency was reduced, which promoted the dispersion distribution of TiB2 particles. The combined modification of (Ce+Yb) and in-situ TiB2 particles played a synergistic role in modifying the microstructure and enhancing the mechanical properties of the composites. When 0.4 wt% (Ce+Yb) was added, the ultimate tensile strength (UTS), yield strength (YS) and elongation (El) of the composites increased to 231.9 MPa, 151.8 MPa and 5.4%, respectively. Compared with the composites without (Ce+Yb) combined modification, the UTS, YS and El increased by 20.5%, 45.1% and 54.3%, respectively.