The Charpy impact toughness of single-phase austenitic Fe-32Mn-0.6C steel was systematically investigated across a wide temperature spectrum from 25 °C to −196 °C using Charpy V-notch impact tests. The material exhibited a remarkable temperature dependence of impact energy, decreasing dramatically from 120 J at ambient temperature (25 °C) to 13 J under cryogenic conditions (−196 °C). Notably, a steep transition in impact energy occurred within the critical temperature window of −100 °C to −150 °C. Microstructural analysis revealed that synergistic effects of high strain rates and low temperatures significantly restrict dislocation slip and multiplication mechanisms, while also suppressing deformation twinning activation. This restricted plasticity accommodation mechanism fundamentally differs from the deformation characteristics reported in conventional low-carbon high-manganese steels and other face-centered cubic (FCC) alloy systems.

The ironless tubular permanent magnet synchronous linear motor (TPMSLM) is in high demand for high-precision servo control applications due to its advantages of having zero cogging effect and high dynamic response. However, its electromagnetic field analysis model has not yet been perfected. This paper aims to accurately predict the magnetic field distribution and electromagnetic performance parameters of an ironless TPMSLM. Taking the axially magnetized ironless TPMSLM as an example, and disregarding the influence of the armature magnetic field on the air gap magnetic field, a simplified analytical model of the TPMSLM is established in the cylindrical coordinate system based on the equivalent magnetization current method (EMC), and the analytical formula for the air gap magnetic flux density is then derived. Subsequently, by applying electromagnetic field theory and the analytical formula for the magnetic flux density in the air gap, analytical expressions for the back electromotive force (back EMF) and thrust are derived, reducing analytical complexity while maintaining accuracy. The accuracy and practicality of the proposed analytical formulas are validated through comparisons with finite element analysis (FEA) and experimental prototypes. This analytical approach facilitates the optimization of linear motor parameters and the study of thrust fluctuation suppression, thereby laying the foundation for high-precision servo control of linear motors.

Achieving strength–ductility synergy in immiscible Ti/Mg laminated composites remains challenging, owing to the absence of metallurgical bonding and the limited slip systems of their hexagonal close-packed (HCP) structures. This study aims to achieve a favorable strength–ductility balance in immiscible Ti/Mg laminated composite plates via low-temperature annealing after hot-roll bonding. The results show that after post-rolling annealing at 200 °C, the bonding strength of the Ti/Mg composite interface increased from 48.74 MPa to over 80 MPa without the formation of obvious intermetallic compounds. In the Mg layer, complete recrystallization eliminated the shear bands, and pyramidal slip—exhibiting the highest Schmid factor—became the dominant strain-accommodation mode. In the Ti layer, recovery, rather than full recrystallization, prevailed. Concurrently, basal and pyramidal slip were co-activated to enable multi-slip load bearing. These complementary deformation modes, coordinated through the strengthened interface, promoted compatible deformation between the layers, in which the plastic flow of the Mg layer relieved local strain concentration in the Ti layer, resulting in a more than twofold increase in elongation with minimal loss of strength. Annealing at 200 °C was identified as the preferred annealing temperature, offering a viable pathway to strength–ductility synergy in immiscible lightweight Ti/Mg laminated composite plates.