Spatial characterization of the thermal-induced phase transformation throughout as-deposited additive manufactured NiTi bulk builds

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Abstract

Transformation temperatures in NiTi shape memory alloys fabricated by laser based directed energy deposition with substrate heating were measured via differential scanning calorimetry. Elementally blended Ni and Ti powders produced Ni-poor (Ti53.1Ni46.9 at.%) and Ni-rich (Ni52.4Ti47.6 at.%) builds. Build volumes approaching three times the largest to date were fabricated, and specimens were extracted at selected locations to spatially resolve temperatures. Measurements were equivalent throughout as-deposited builds, and the dependence on Ni concentration corresponded to observations for conventionally processed alloys.

Original languageEnglish (US)
Pages (from-to)56-59
Number of pages4
JournalScripta Materialia
Volume101
DOIs
StatePublished - May 1 2015

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phase transformations
Phase transitions
shape memory alloys
Shape memory effect
Powders
Differential scanning calorimetry
heat measurement
Heating
Temperature
heating
scanning
temperature
Lasers
Substrates
lasers
Hot Temperature
energy
titanium nickelide

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Cite this

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abstract = "Transformation temperatures in NiTi shape memory alloys fabricated by laser based directed energy deposition with substrate heating were measured via differential scanning calorimetry. Elementally blended Ni and Ti powders produced Ni-poor (Ti53.1Ni46.9 at.{\%}) and Ni-rich (Ni52.4Ti47.6 at.{\%}) builds. Build volumes approaching three times the largest to date were fabricated, and specimens were extracted at selected locations to spatially resolve temperatures. Measurements were equivalent throughout as-deposited builds, and the dependence on Ni concentration corresponded to observations for conventionally processed alloys.",
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AU - Hamilton, Reginald Felix

AU - Palmer, Todd

AU - Bimber, Beth A.

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Y1 - 2015/5/1

N2 - Transformation temperatures in NiTi shape memory alloys fabricated by laser based directed energy deposition with substrate heating were measured via differential scanning calorimetry. Elementally blended Ni and Ti powders produced Ni-poor (Ti53.1Ni46.9 at.%) and Ni-rich (Ni52.4Ti47.6 at.%) builds. Build volumes approaching three times the largest to date were fabricated, and specimens were extracted at selected locations to spatially resolve temperatures. Measurements were equivalent throughout as-deposited builds, and the dependence on Ni concentration corresponded to observations for conventionally processed alloys.

AB - Transformation temperatures in NiTi shape memory alloys fabricated by laser based directed energy deposition with substrate heating were measured via differential scanning calorimetry. Elementally blended Ni and Ti powders produced Ni-poor (Ti53.1Ni46.9 at.%) and Ni-rich (Ni52.4Ti47.6 at.%) builds. Build volumes approaching three times the largest to date were fabricated, and specimens were extracted at selected locations to spatially resolve temperatures. Measurements were equivalent throughout as-deposited builds, and the dependence on Ni concentration corresponded to observations for conventionally processed alloys.

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