Core Viewpoint - The 1J87 soft magnetic alloy demonstrates competitive mechanical rigidity and controllable melting point, making it suitable for applications requiring high magnetic permeability and medium to high-temperature stability [9] Group 1: Material Properties - The typical elastic modulus of 1J87 soft magnetic alloy is around 205 GPa, with a measured range of 190–210 GPa [1] - The melting point of 1J87 soft magnetic alloy ranges from approximately 1380°C to 1430°C, with distinct characteristics of partial melting [1] - Initial magnetic permeability is about 8000, with coercivity around 0.6 A/m [4] Group 2: Comparative Analysis - In terms of magnetic permeability and cost, 1J87 soft magnetic alloy outperforms conventional low-silicon iron but is more expensive than low-cost Fe-based materials [5] - 1J87 soft magnetic alloy maintains better elastic modulus stability after high-temperature annealing compared to some high-Ni alloys, but its magnetic permeability may decrease after deep cryogenic processing [5] - Three measured comparisons (elastic modulus, melting point, initial magnetic permeability) follow ASTM E1875 and GB/T 228.1-2010 testing methods for cross-validation [5] Group 3: Microstructural Analysis - The elastic modulus of 1J87 soft magnetic alloy is directly related to its microstructural composition, grain size, and residual stress [6] - The presence of trace impurities (S, P) can lower the local melting temperature and increase the width of the eutectic region, leading to double peaks in DSC curves [6] Group 4: Process Comparison - Process Route A (vacuum induction melting + casting + high-temperature annealing) offers uniform composition and low gas content, ensuring good consistency in elastic modulus and melting point [7] - Process Route B (powder metallurgy + hot isostatic pressing) can achieve finer grain structures and higher magnetic permeability, but cost and grain boundary control are contentious points [7] - Decision-making for process selection involves input requirements (high magnetic permeability, high-temperature stability, low cost) and scoring based on project weight [7] Group 5: Common Misconceptions - Misconception 1: Relying solely on chemical composition to determine elastic modulus while neglecting the impact of heat treatment history [8] - Misconception 2: Extrapolating room temperature magnetic permeability data to high-temperature conditions without considering the coupling effects of demagnetization and phase changes [8] - Misconception 3: Selecting materials based only on raw material market prices without considering process value-added costs and failure rates [8]