Thermomechanical processing effects on the structure and properties of Fe-based SMAs. I. Evolution of phase structure

The paper analyses the effects of heat treatment (HT) and mechanical alloying (MA) on the evolution of phase structure of an Fe-Mn-Si-Cr-Ni Shape Memory Alloy (SMA) obtained by powder metallurgy (PM). Using various amounts of mechanically alloyed (MA'ed) powders, namely 0 and 40 vol. %, two gro...

Full description

Saved in:
Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-03, Vol.485 (1), p.12004
Main Authors: Bulbuc, V, Pricop, B, Popa, Mihalache, E, Özkal, B, Bujoreanu, L G
Format: Article
Language:English
Subjects:
Alloy powders
Alloying effects
Chemical composition
Chromium
Evolution
Heat treating
Heat treatment
Hot rolling
Manganese
Martensite
Martensitic transformations
Mechanical alloying
Nickel
Powder metallurgy
Shape memory alloys
Silicon
Sintering (powder metallurgy)
Solid phases
Structural analysis
Thermomechanical treatment
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The paper analyses the effects of heat treatment (HT) and mechanical alloying (MA) on the evolution of phase structure of an Fe-Mn-Si-Cr-Ni Shape Memory Alloy (SMA) obtained by powder metallurgy (PM). Using various amounts of mechanically alloyed (MA'ed) powders, namely 0 and 40 vol. %, two groups of specimens with chemical composition Fe-14Mn-6Si-9Cr-5Ni (mass.%) were produced by PM. After blending, pressing, sintering and hot-rolling, each set of samples was subjected to five different heat treatment temperatures 973, 1073, and 1373 K, respectively. Tensile pre-straining tests were performed on all samples, with increasing pre-straining degrees up to 4.5 %, in order to stress-induce ε (hcp) martensitic phase in the material. Structural analysis was implemented by means of X-ray diffraction and SEM observations. XRD and SEM investigations revealed the formation of thermally induced α'-bcc martensite, besides ε-hcp, as a particularity of this powder metallurgy, mechanically alloyed, shape memory alloy.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/485/1/012004