It is common to use heat treatment process to control the microstructure of additive manufacturing parts and improve the mechanical properties. However, there are few reports about the control of microstructure properties of WAAM hybrid inter-layer hammering fabricated parts by heat treatment. In this study, the effect of annealing on microstructure and mechanical properties of inter-layer hammering hybrid wire arc additively manufactured aluminum alloy was studied. The ratio variation of fine grain (FG) and coarse grain (CG) regions, grain size and dislocations were analyzed, and the strength-plasticity mechanism was revealed. The results shown that with the increase of annealing temperature, the ratio of FG and CG region changed from 4:1–1:5, grain growth and recrystallization happened in FG and CG regions, respectively, dislocations mostly retained in FG region and released in CG region. With the introduction of annealing and the increase of annealing temperature, the strength of
The influence of annealing treatment on the mechanical properties and interfacial characteristics of a TA1/Al5083 bimetal composite was investigated in this research. The bimetal composite plates were prepared by explosive welding and annealing at temperatures ranging from 400 to 550 °C at intervals of 50 °C for 3 h. Uniaxial tensile and shear tests were employed to study the influence of the annealing treatments. Uniaxial tensile tests indicate that the tensile strength and elongation display a tendency to first improve and then decrease with increasing annealing temperature. No obvious necking phenomenon is observed in the composite sheet annealed at 400 and 450 °C, and extremely short cracks appear in the interfacial transition zone, while localized necking and delamination phenomena are found to occur in the composite sheet annealed at 500 and 550 °C. The ultimate tensile strength and elongation of specimens annealed at 450 and 500 °C is improved, while specimens annealed at 5
Different annealing treatments at 400-900 °C for 1 h were applied on copper/SS304L composite sheets, and the evolutions of microstructure and mechanical properties were investigated in this study. It is found that the diffusion distance of the elements at the interface is slightly increased with the increasing temperature. In addition, the grain coarsening in copper, the phase transformation from BCC to FCC in SS304L, and the decreased dislocation density after annealing soften the composite sheets, leading to decreased hardness and strength, as well as significantly improved ductility, especially when the temperature exceeds 500 °C.
This paper explains the effect of structural behaviour and electrical properties of cubic NaZn13-type La(FeSi)13 compounds annealed at different high temperatures from 1000ºC to 1200ºC. The Raman spectroscopy measurement revealed a different level of coexistence of La(FeSi)13-type phase and α-Fe in 1000ºC, 1100ºC and 1200ºC annealed samples. The different level coexistence of the phases suggested that the samples show a significant phase change with different annealing temperature. This finding has also supported by impedance analyzer measurement, where the pattern shows that the 1000ºC and 1100ºC samples have similar behaviour waveform pattern compared to the 1200ºC. Also, the impedance pattern clearly shows that the propagation of the signal for the 1000ºC and 1100ºC before it arrives in the conductor state (R=0.00) has high resistive values compared to 1200ºC annealed samples. Further investigation on the electrical properties were done with the conductivity and tan delt