Modeling Plasticity of Ni3Al-Based L12 Intermetallic Single Crystals-I. Anomalous Temperature Dependence of the Flow Behavior (Preprint)

Abstract

A comprehensive mechanism-based crystallographic constitutive model has been developed for L 12-structured Ni3Al-based intermetallic single crystals. This model represents the unusual thermo-mechanical behaviors of Ni3Al, such as the anomalous temperature dependence of both the flow stress and strain-hardening rate (SHR), the strain dependence of these anomalous behaviors, and an orientation-dependent tension-compression asymmetry. The model framework was based on two major contributions to plastic flow, namely the repeated cross-slip exhaustion and athermal defeat of screw-character dislocations, and the motion of the macro-kinks (MKs). The contribution of irreversible obstacle storage was incorporated into the constitutive formulations as a resistance against the glide of MKs. The model was implemented in a finite element method numerical framework, and the simulation results showed qualitative agreement with experimental observations.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2006
Accession Number
ADA463681

Entities

People

  • Dennis M. Dimiduk
  • Michael D. Uchic
  • Triplicane A. Parthasarathy
  • Yoon-suk Choi

Organizations

  • Universal Energy Systems

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Asymmetry
  • Crystal Structure
  • Crystals
  • Hardening
  • Mechanical Properties
  • Orientation (Direction)
  • Physical Properties
  • Plastic Flow
  • Plastic Properties
  • Shear Stresses
  • Simulations
  • Single Crystals
  • Strain Hardening
  • Stresses
  • Two Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.