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Opportunity at National Institute of Standards and Technology (NIST)

Ultrasonic Nondestructive Evaluation of Additively Manufactured Alloys

Location

Material Measurement Laboratory, Applied Chemicals and Materials Division

RO# Location
50.64.72.C0160 Boulder, CO

Please note: This Agency only participates in the February and August reviews.

Advisers

Name E-mail Phone
Hrabe, Nikolas Wilson nik.hrabe@nist.gov 303.497.3424
Johnson, Ward L. wjohnson@boulder.nist.gov 303.497.5805

Description

Additive manufacturing (AM) by laser or electron-beam melting of metal powder has emerged in this century as a transformational technology for fabricating near-net-shape metallic parts and generating microstructures that are infeasible with conventional metallurgy.  However, the degree of commercial adoption of AM parts is impeded by current limitations on material validation, which are linked to limitations on post-process nondestructive evaluation (NDE) with conventional methods.  This project seeks to develop innovative ultrasonic methods for characterizing AM alloys and identifying connections between as-manufactured acoustic properties and in-service mechanical performance.  Rather than focusing on time-consuming and resolution-limited acoustic imaging of individual flaws, the project seeks to develop resonance methods and associated physical models for characterizing acoustic damping, nonlinearity, and/or changes in elastic stiffness that arise from distributions of performance-degrading defects.

Keywords:
Additively Manufactured Materials; Nondestructive Evaluation; NDE; Ultrasonics; Resonant Acoustics; Defects; Anelasticity; Nonlinearity

Eligibility

Citizenship:  Open to U.S. citizens
Level:  Open to Postdoctoral applicants
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