Effect of Cr and Ni on the temperature dependence of deformation behavior and shape memory effects in Fe-Mn-Si alloys

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:476716

Rong, L J; Li, Y Y; Cheng, H M; Shi, C X ^[1]

---

1. Institute of Metal Research, Shenyang (China)

Effects of Cr and Ni on the tensile deformation behavior and shape memory effect (SME) in Fe-Mn-Si shape memory alloys have been investigated over the temperature range of 293-77 K. It was found that the increase of stacking fault energy (SFE) in Fe-Mn-Si alloys by additions of Cr and Ni can result in a decreased temperature dependence of work hardening, which is determined by thermal-induced martensite, intersection of {epsilon}-plates with stacking faults, and difficult cross slip of dislocations in low SFE alloys. Moreover, the increase of c/a ratio for martensite in Cr and Ni bearing alloys can reduce the interfacial energy and shear deformation required for the formation of fcc twins and facilitate their formation. As a result, the penetration process of {epsilon}-plates on different (111) planes can be avoided through the formation of e-martensite in fcc twins, and the SME is improved.

• OSTI ID: 476716
• Report Number(s): CONF-950722--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42A; ISSN 0065-2482; ISSN ACYEAC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
AUSTENITIC STEELS
CHROMIUM
DEFORMATION
NICKEL
SHAPE MEMORY EFFECT
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES