A Study of the Effects of Mechanical Alloying Fraction, Solution Treatment Temperature and Pre-Straining Degree on the Structure and Properties of a Powder Metallurgy-Produced FeMnSiCrNi Shape Memory Alloy

• DOI: 10.3390/cryst15020105
• Publication Date: 2025-01-21T16:47:32Z
• Authors: Elena Matcovschi; Bogdan Pricop; Nicoleta-Monica L...; Mihai Popa; Gheorghe Bădărău; Nicanor Cimpoeșu; Burak Ozkal; Leandru-Gheorghe ...
• Keywords: Powder Metallurgy; Degree (music); Fraction (chemistry)

A shape memory alloy with the chemical composition Fe-14Mn-6Si-9Cr-5Ni (mass %) was produced by powder metallurgy (PM) from as-blended powders mixed mechanically alloyed (MA’ed) volumes in amounts of 0, 10 and 20. After blending, pressing sintering, specimens were hot-rolled, spark erosion cut different configurations solution-treated between 700 1100 °C. metallographic preparation, structural analyses performed X-ray diffraction microscopic observation optical scanning electron microscopy (SEM). The revealed presence thermal- stress-induced martensites caused solution treatment pre-straining. Due to relatively low Mn amount, significant quantities α′ body center cubic martensite formed during post-solution water cooling. Solution-treated lamellar underwent a training thermomechanical comprising repeated cycles room temperature bending, heating sputtered By cinematographic analysis, occurrence effect (SME) revealed, spite large amount bcc martensite. Tensile subjected failure tests pre-straining (up 4% permanent strain, after loading–unloading). tensile pre-straining, diminution noticed on XRD patterns, which associated formation internal sub-bands substructure observed high-resolution SEM. These results prove that SME can be obtained trained PM_MA’ed thermally induced martensite, is impeded sub-bands.