In this paper

the high-strength titanium alloy skeleton structure was prepared by laser selective melting (SLM). Titanium–aluminum composite with different thickness and crystal morphology was formed by smelting the filled aluminum powder/bulk. It was found that diffusion reaction occurred between the interface of Ti–6Al–4V strengthening skeleton and Al–Mg–Sr–Zr alloy matrix

forming a dense metallurgical bonding. The precipitated phases in the interface were mainly TiAl

3

TiAl

TiAl

2

and Ti

3

Al

5

. With the increase of smelting temperature and holding time

thickness of the int

erface reaction layer gradually increased

reaching 600 μm at 800 ℃–1 h

which proves strong bonding of the composite structure interface. The elastic modulus of the reinforced skeleton

aluminum alloy matrix and reaction interface was analyzed. It was found that the elastic modulus of the reaction layer (1.2×10

11

Pa) was higher than that of the titanium alloy reinforced skeleton (1.07×10

11

Pa) and the aluminum alloy matrix (7.1×10

10

Pa). The results provide theoretical basis for the spatial controllable strengthening of aluminum alloys

which is expected to overcome the inverse relationship between strength and toughness of traditional materials.