Core Insights - The article discusses the 1J65 soft magnetic alloy, highlighting its chemical composition and key technical parameters, which include a saturation magnetic flux density (Bs) of approximately 0.7–0.9 T, initial permeability (μi) reaching 3×10^4–5×10^4, and coercivity (Hc) of ≤0.8 A/m [2] Material Properties - The 1J65 soft magnetic alloy is characterized by high nickel and low carbon content, with a tensile strength (Rm) reference value of 300–500 MPa and an elongation (A%) of around 25% [2] - The alloy's performance can be significantly improved through heat treatment, although this may lead to a reduction in mechanical strength, which can be partially restored through subsequent cold processing [5] Market Dynamics - The cost of the alloy is influenced by fluctuations in LME nickel prices, which recently fell by 5%, and a decrease of approximately 3% in the Shanghai nonferrous metals market [3] Performance Comparison - Three sets of measured data show that the coercivity (Hc) decreases from 2.1 A/m in cold-rolled state to 0.55 A/m after strain relief annealing, while initial permeability (μi) increases from 1.2×10^4 to 3.4×10^4 [4] - The tensile strength (Rm) varies from 480 MPa in cold-rolled state to 410 MPa after strain relief annealing [4] Microstructural Analysis - Microstructural observations indicate that cold-rolled structures exhibit high orientation and dislocation density, while stress annealing helps in grain recovery and reduces processing hardening, explaining the decrease in Hc and increase in μi [6] Technical Controversies - There is a debate between high-temperature solution treatment followed by rapid cooling versus low-temperature stress annealing regarding which method is superior for achieving desired magnetic properties [7] - The choice of process depends on end-user requirements, with low Hc favoring stress annealing and high Bs favoring solution treatment [7] Decision-Making Framework - A decision tree is proposed for selecting processing routes based on whether the target is extremely low Hc or high strength, with further adjustments possible through intermediate tempering if necessary [8] Common Misconceptions - The article identifies three common misconceptions in material selection: focusing solely on alloy designation without considering heat treatment, judging performance based solely on chemical composition, and making decisions based on a single price indicator without accounting for total cost differences [10]