The effects of boron addition on the magnetic and mechanical properties of NiMnSn shape memory alloys

Aydogdu Y., Turabi A. S., Aydogdu A., Kok M., Yakinci Z. D., Karaca H. E.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, cilt.126, sa.2, ss.399-406, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 126 Sayı: 2
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1007/s10973-016-5576-6
  • Dergi Adı: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.399-406
  • Anahtar Kelimeler: Shape memory effect, Boron addition, Saturation magnetization, Phase transformation, Thermal characterization, Composition alteration, INDUCED PHASE-TRANSFORMATION, MARTENSITIC-TRANSFORMATION, FIELD, MAGNETOPLASTICITY, MICROSTRUCTURE, TEMPERATURES, CO
  • Gazi Üniversitesi Adresli: Evet

Özet

The effects of boron addition on the microstructure, magnetic, mechanical, and shape memory properties of Ni50Mn40-xSn10Bx (at.%) (x = 1, 2, 3, 4, 6, 8) polycrystalline alloys were systematically investigated. It was revealed that transformation temperatures, magnetic behavior, mechanical, and shape memory properties can be tailored by B content. Transformation temperatures were decreased while saturation magnetization was increased with the addition of boron. In addition to magnetic behavior, ferromagnetic austenite transforms to weakly magnetic martensite, and then, martensite becomes ferromagnetic during cooling. The low amount of B addition (up to 4 %) to NiMnSn creates the second phase which provides higher strength and ductility. However, the high volume fraction of the second phase reduces the shape recovery because the phase transformation does not occur in the second phase. Brittleness takes place when the B amount is more than 6 % in NiMnSnB alloys. The amount of boron content in the NiMnSnB alloys plays a significant role to modify the magnetic, mechanical, and shape memory properties.