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<p>Ti/Al metallic multi-materials combine the advantages of both materials. The balance between their lightness and strength endows them with considerable application potential. However, the significant differences in their physicochemical properties and generation of brittle metallic intermediate phases have largely hampered the development of Ti/Al multi-materials. In this study, Ti6Al4V/AlMgScZr multi-materials were prepared without macroscopic defects by selective laser melting (SLM) and optimization of their process parameters. Molten pool stirring prompted the mixing of the two materials for a width of approximately 200&#xa0;μm. Along the building direction, the bonding layer revealed acicular martensite α-Ti, brittle intermetallic compounds dominated by serrated TiAl3 (10&#xa0;μm in size), and equiaxed α-Al grains. The mechanical experiments showed that the tensile specimen is dominated by brittle fracture at the interface with an ultimate tensile strength of 286.2&#xa0;MPa. The three-point bending specimen failed with a bending angle of up to 40° and an ultimate bending strength of 1360&#xa0;MPa. The nanohardness at the interface was 4.82&#xa0;GPa. This study demonstrated the potential of SLM for preparing Ti/Al multi-materials with excellent properties, providing an experimental basis for new lightweight and high-strength aerospace materials.</p>

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Laser Selective Melting of Ti6Al4V/AlMgScZr Lightweight Metallic Multi-Materials: Parameter Optimization, Microscopic Characteristics, and Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Ke-fan Li,
  • Lei Jia,
  • Quan-long Wu,
  • Shi-feng Wen,
  • Yan Zhou,
  • Yu-sheng Shi

摘要

Ti/Al metallic multi-materials combine the advantages of both materials. The balance between their lightness and strength endows them with considerable application potential. However, the significant differences in their physicochemical properties and generation of brittle metallic intermediate phases have largely hampered the development of Ti/Al multi-materials. In this study, Ti6Al4V/AlMgScZr multi-materials were prepared without macroscopic defects by selective laser melting (SLM) and optimization of their process parameters. Molten pool stirring prompted the mixing of the two materials for a width of approximately 200 μm. Along the building direction, the bonding layer revealed acicular martensite α-Ti, brittle intermetallic compounds dominated by serrated TiAl3 (10 μm in size), and equiaxed α-Al grains. The mechanical experiments showed that the tensile specimen is dominated by brittle fracture at the interface with an ultimate tensile strength of 286.2 MPa. The three-point bending specimen failed with a bending angle of up to 40° and an ultimate bending strength of 1360 MPa. The nanohardness at the interface was 4.82 GPa. This study demonstrated the potential of SLM for preparing Ti/Al multi-materials with excellent properties, providing an experimental basis for new lightweight and high-strength aerospace materials.