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Title: NiTi-Enabled Composite Design for Exceptional Performances

In an effort to further develop shape memory alloys (SMAs) for functional applications, much focus has been given in recent years to design and create innovative forms of SMAs, such as functionally graded SMAs, architecture SMAs, and SMA-based metallic composites. Here, we reports on the progress in creating NiTi-based composites of exceptional properties stimulated by the recent discovery of the principle of lattice strain matching between the SMA matrix and superelastic nanoinclusions embedded in the matrix. And based on this principle, different SMA–metal composites have been designed to achieve extraordinary shape memory performances, such as complete pseudoelastic behavior at as low as 77 K and stress plateau as high as 1600 MPa, and exceptional mechanical properties, such as tensile strength as high as 2000 MPa and Young’s modulus as low as 28 GPa. Details are given for a NiTi–W micro-fiber composite prepared by melt infiltration, hot pressing, forging, and cold rolling. Furthermore, the composite contained 63% in volume of W micro-fibers of ~0.6 μm thickness. In situ synchrotron X-ray diffraction revealed that the NiTi matrix underwent martensite transformation during tensile deformation while the W micro-fiber deformed elastically with a maximum strain of 0.83% in the loading direction, implying a Wmore » fiber stress of 3280 MPa. The composite showed a maximum high tensile strength of 2300 MPa.« less
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  1. China Univ. of Petroleum, Beijing (China). State Key Lab. of Heavy Oil Processing, Dept. of Materials Science and Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  3. Univ. of Western Australia, Crawley, WA (Australia). School of Mechanical and Chemical Engineering
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Shape Memory and Superelasticity
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2199-384X
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC); Australian Research Council
Country of Publication:
United States
36 MATERIALS SCIENCE; composite; martensite transformation; nanowires; shape memory alloy
OSTI Identifier: