Energetic structural materials (ESMs) are an important class of military materials due to their good structural and energy-releasing characteristics. To improve the damage effect of metal–metal ESMs with good mechanical properties, W was added to the 48Al–52Ni composites, and the effect of W on the impact-induced energy release behaviors was investigated. The results showed that the hot-press process and the addition of W did not change the microstructure and surface state of the constituent particles, leading to a stable onset temperature of the Al–Ni intermetallic reaction in (48Al–52Ni)_100-xW_x composites. Meanwhile, the decrease in the contact area between Al and Ni in the composites with increased W content resulted in the decrease in reaction heat. During the impact process, the intermetallic reaction of W caused by the Al–Ni intermetallic reaction, as well as the oxidation reaction of Al and Ni caused by the brittle fracture along the weak interface, caused the released energy of (48Al–52Ni)₄₀W₆₀ to reach 2.04 kJ/g.

The phase equilibrium and phase transformation of the Al–Si–Y ternary system were investigated in 80 annealed alloys using an electron probe microanalysis (EPMA), X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The phase equilibrium at 773 K was determined, and the phase distribution and solid solubility of the Al–Si–Y isothermal section at 773 K were obtained. A total of 23 three-phase zones and 4 two-phase zones were obtained, and 2 new ternary compounds, AlSi₄Y₅ and Al₂Si₃Y₅, were identified from the non-aluminum-rich corner. Additionally, the phase transition temperatures of representative alloys were determined by the DSC method, and then the phase transition temperatures were processed to obtain the experimental points of vertical sections. In the Al–Si–Y alloy system, the phase diagrams of the vertical sections with X(Al) = 90 at.%, 80 at.%, 70 at.% and 60 at.% at the aluminum-rich corner were calculated, and then the experimental points were inserted into the vertical section phase diagrams. The results of the vertical sectional experiments obtained from the validation experiments are in good agreement with the vertical sectional data obtained from the calculations, indicating that the validated thermodynamic description is useful for the microstructure design of the aluminum-rich corner of the Al–Si–Y ternary alloy.

The isothermal section of the La–Co–Ni ternary system at 723 K has been constructed in this work by using X-ray diffraction (XRD), scanning electron microscopy, and energy dispersion spectroscopy techniques (SEM-EDS). The experimental results show no existence of ternary compounds at 723 K. The isothermal section consists of 16 two-phase regions and 8 three-phase regions. La₃Co and La₃Ni, La₂Co₃ and La₂Ni₃, La₂Co₇ and La₂Ni₇, and LaCo₅ and LaNi₅ form a continuous solid solution. The ternary solid solubility of Ni in LaCo₁₃ phase and La₂Co_1.7 phase was determined to be 15.61 at.% and 9.61 at.%, respectively. The solid solubility of Co in the LaNi₃, La₇Ni₃, and LaNi phases was 18.07 at.%, 5.62 at.%, and 8.49 at.%, respectively. The present experimental results are important for the design of La(Fe,Si)₁₃-based magnetic refrigeration materials.

This study presents a comprehensive investigation of the thermomechanical behavior of diamond reinforced metal matrix composites (DRMMCs) by developing a multiscale constitutive model without any empirical parameters. The model integrates effective inclusion theory with Mori-Tanaka homogenization and interfacial spring mechanic to accurately simulate the coupled response of DRMMCs simultaneously, including effective elastic response, average thermal expansion, and theoretical heat transport. By qualitatively revealing the underlying mechanism of thermomechanical response, the significant thermomechanical properties including the effective elastic constants (EECs), average coefficients of thermal expansion (CTE) and theoretical thermal conductivity (TC) of DRMMCs can be precisely predicted. Results indicate that the multiscale thermomechanical response involves the bidirectional interaction between temperature and stress fields across the multiscale architecture comprising diamond reinforcements, interfacial constituents, and metal matrix. This coupling is fundamentally driven by the thermomechanical mismatches in intrinsic properties between the constituents, while the interfacial constituents act as a critical regulatory mediator that regulate the intensity and direction of the coupling effect. Through the dynamic feedback loop of thermally induced stress-elastic deformation-heat transfer, the coupling effect directly determines the EECs, CTE, and TC of DRMMCs. This work provides a robust theoretical and modeling foundation for the design of high-performance thermal management materials with tailorable thermomechanical characteristics.