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Controlling the extent of atomic ordering in intermetallic alloys through additive manufacturing

Journal Article · · Additive Manufacturing
 [1];  [2];  [1];  [3];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
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Control of the atomic structure, as measured by the extent of the embrittling B2 chemically ordered phase, is demonstrated in intermetallic alloys through additive manufacturing (AM) and characterized using high fidelity neutron diffraction. As a layer-by-layer rapid solidification process, AM was employed to suppress the extent of chemically ordered B2 phases in a soft ferromagnetic Fe-Co alloy, as a model material system of interest to electromagnetic applications. The extent of atomic ordering was found to be insensitive to the spatial location within specimens and insinuates that the thermal conditions within only a few AM layers were most influential in controlling the microstructure, in agreement with the predictions from a thermal model for welding. Analysis of process parameter effects on ordering found that suppression of B2 phase was the result of an increased average cooling rate during processing. AM processing parameters, namely interlayer interval time and build velocity, were used to systematically control the relative fraction of ordered B2 phase in specimens from 0.49 to 0.72. Hardness of AM specimens was more than 150% higher than conventionally processed bulk material. Implications for tailoring microstructures of intermetallic alloys are discussed.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1542229
Alternate ID(s):
OSTI ID: 1544796
Journal Information:
Additive Manufacturing, Journal Name: Additive Manufacturing Journal Issue: C Vol. 28; ISSN 2214-8604
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (7)

Figure 1(p. 6)figure Figure 1
Table I(p. 9)table Table I
Figure 2(p. 10)figure Figure 2
Figure 3(p. 14)figure Figure 3
Figure 4(p. 16)figure Figure 4
Figure 5(p. 17)figure Figure 5
Figure 6(p. 19)figure Figure 6

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Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING