Fe-Mn-Si Shape Memory Alloy

Verifiedmetal
· FeMnSi· Iron-Manganese-Silicon SMA· Fe-SMA

Fe-Mn-Si shape memory alloy is an iron-based intermetallic compound that exhibits reversible martensitic phase transformation, enabling controlled recovery of pre-set shapes when heated above its transition temperature. This alloy system is valued in engineering applications requiring low-cost alternatives to nickel-titanium (NiTi) SMAs, with particular strength in seismic damping, pipeline couplings, and thermal actuators where moderate recovery strain and reliable cycling performance are acceptable trade-offs for reduced material cost and improved corrosion resistance. Unlike NiTi, Fe-Mn-Si alloys tolerate larger thermal hysteresis windows and perform well in iron-rich industrial environments, making them especially competitive in civil infrastructure, automotive safety systems, and geothermal applications.

seismic damping devicespipeline couplings and connectorsthermal actuatorsearthquake-resistant building bracketsautomotive crash energy absorptiongeothermal and industrial piping systems

Compliance & Regulations

?EAR?Conflict Free?FDA?RoHS?REACH?TSCA?Prop 65
Units:
siimperial
Property OverviewNormalized to typical max values
PropertyValueUnitConditionsSource
Elongation at Break(εf)
25.00
-—
Poisson's Ratio(ν)
0.2800
-—
Recovery Strain(ε_rec)2 entries
3.000
-—
↳
2.000
-—
Stress–Strain Curve(σ–ε)
Curve (12 pts)
ksi20°C
Ultimate Tensile Strength(σUTS)
98.63
ksi—
Yield Strength (0.2% offset)(σy)
50.76
ksi—
Young's Modulus(E)
23,206
ksi—
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Austenite Finish Temperature (Af)(Af)
319.7
°F—
Martensite Start Temperature (Ms)(Ms)
211.7
°F—
Thermal Conductivity(k)
8.667
BTU/(hr·ft·°F)—
Thermal Hysteresis(ΔT_hyst)
-279.6
°F—
Verified Unverified Low confidence (<80%) Link to source
PropertyValueUnitConditionsSource
Density(ρ)
0.2710
lb/in³—
Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Export Control

Safety & Biocompatibility

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.
Fe-Mn-Si Shape Memory Alloy — Properties & Data | MatWorld