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Deformation behavior and phase transformation of nanotwinned Al/Ti multilayers

Journal Article · · Applied Surface Science
 [1];  [2];  [3];  [2];  [2];  [4];  [2];  [2];  [2];  [2];  [2];  [3];  [2]
  1. Purdue Univ., West Lafayette, IN (United States); Purdue Univ., West Lafayette, IN (United States)
  2. Purdue Univ., West Lafayette, IN (United States)
  3. Univ. of Nebraska, Lincoln, NE (United States)
  4. Harbin Institute of Technology, Shenzhen (China)
We report nanotwinned Al/Ti multilayers have exhibited size-dependent microstructure evolution and high strength. However, their deformation mechanisms are less well understood. In this work, we investigated the deformation mechanisms of nanotwinned Al/Ti multilayers with FCC/HCP layer interfaces by using in situ micropillar compression tests. Nanotwinned Al/Ti multilayers exhibit compressive strength up to 2.4 GPa and good work hardening capability. Post-compression TEM analyses reveal high-density stacking faults and the HCP-to-FCC phase transformations in Ti. Molecular dynamics simulations elucidate the mechanisms of deformation induced phase transformation in Ti and the influence of collective movement of partial dislocations on the deformability of Al/Ti multilayers.
Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016337
OSTI ID:
1852187
Alternate ID(s):
OSTI ID: 1634160
Journal Information:
Applied Surface Science, Journal Name: Applied Surface Science Journal Issue: C Vol. 527; ISSN 0169-4332
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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