Effects of different annealing processes on the mechanical properties and interfacial microstructure of warmrolled Ti/Al/Al/Fe laminated multimetallic composite plates (LMCs) are investigated in this manuscript. The results indicate that with the increase of annealing temperature, the thickness of the interface diffusion layer gradually increases, the bonding strength of Ti/Al interface gradually increases, while the tensile shear strength of Fe/Al interface first decreases and then increases. When annealing at 550 ℃/1 h, Ti/Al/Al/Fe composite plates exhibit the best comprehensive properties, tensile strength (170 MPa) and elongation after break (52%). After annealing, TiAl₃ phase is formed at the Ti/Al interface, while FeAl₃, Fe₂Al₅, and Fe₄Al₁₃ phases are formed at the Fe/Al interface. The interface gradually transitions from mechanical meshing to large-area metallurgical bonding.

This study employs laser cladding technology to fabricate AlSi10Mg/40%WC coatings on SiC_p/2009Al substrates, systematically investigating the effects of annealing treatments at 200 ℃, 250 ℃, and 300 ℃ (for 2 hours) on the microstructure and mechanical properties. Analysis by XRD, SEM, and EDS reveals that annealing facilitated Si precipitation and enhanced the uniformity of elemental distribution throughout the coating, while the phase composition remains unchanged. A progressive leftward shift in XRD diffraction peaks with increasing annealing temperature indicates reduced lattice distortion. Mechanical evaluations demonstrate that 250 ℃-2 h annealing decreased microhardness to 238.65 HV (15.9% reduction) while increasing fracture toughness (K_IC) to 31.28 MPa·m^1/2 (17.1% improvement). Wear performance analysis shows a 16.2% reduction in mass loss (decreased from 4.58 mg (unannealed) to 3.84 mg) and a stabilized friction coefficient around 0.30±0.02. Comparatively, while 300 ℃ annealing achieves a slightly higher K_IC enhancement (31.37 MPa·m^1/2), it results in significant hardness degradation (to 223.16 HV) and increased wear loss (to 7.42 mg), attributed to Si phase coarsening. The 250 ℃-2 h annealing treatment achieves a synergistic optimization of hardness, toughness, and wear resistance, providing critical theoretical insights for developing high-performance laser clad composite coatings.