Microstructure and shape memory properties of Cu-Al-Fe alloys with different Al contents made by additive manufacturing technology
نویسندگان
چکیده
Abstract The Al contents play an exceedingly important role in Cu-Al system shape memory alloys (SMAs), and Cu-Al-Fe alloy represents the new development directions of SMAs. Cu-xAl-4Fe (x = 11, 13, 15 wt%) alloys, which take powder core wire with a structure resistant to element burning as additive manufacturing materials, were prepared by arc melt deposition process. In this work, as-deposited, quenched deformed microstructure was studied detail utilizing OM, SEM, XRD. properties analyzed bending tests. effect mechanism content on also investigated. Results show that as-deposited presents sub-eutectic hyper-eutectic characteristics rise content. After quenching, 11 wt% Al, 13 are α ‘ martensite, β 1 ’ austenite high order degrees. Under 4% pre-strain, recovery rate is 100%, but only 22.6%. However, compared ductility alloy, poor, causes failure withstand pre-strain. deformation, cracks along crystals appear cause strip break. analysis indicates have intense sensitivity element. martensitic degree elevated increase content, grain interface gradually becomes sharper. Solidification impurities formed at boundary during process due influence energy. At same time, invading O 2 combines more active form metal oxidation, markedly reduces strength alloy. As result, cannot be reflected case
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ژورنال
عنوان ژورنال: Materials research express
سال: 2022
ISSN: ['2053-1591']
DOI: https://doi.org/10.1088/2053-1591/ac8d4f