Strong work hardening in a high niobium-containing TiNi-based bulk glassy alloy composite
In this study, a high niobium-containing bulk glassy alloy composite Ti 41 Ni 39 Nb 17.5 Al 2.5 consisting of amorphous, B2-TiNi and β -Nb phases was fabricated through in situ precipitation strategy by utilizing copper-mold suction casting. Upon compressive loading, the composite alloy showed a pro...
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Published in | Journal of materials research Vol. 36; no. 6; pp. 1367 - 1375 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
28.03.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | In this study, a high niobium-containing bulk glassy alloy composite Ti
41
Ni
39
Nb
17.5
Al
2.5
consisting of amorphous, B2-TiNi and
β
-Nb phases was fabricated through in situ precipitation strategy by utilizing copper-mold suction casting. Upon compressive loading, the composite alloy showed a pronounced average plastic strain of (17.6 ± 3.5)% and a high fracture strength of (2279 ± 33) MPa together with a strong work-hardening deformation behavior. The volume fraction of the amorphous phase in the composite was determined to be around 23 vol%. The work softening caused by the formation of shear bands can be compensated by the work hardening arising from the pile-ups of dislocation and severe lattice distortion in the precipitated crystals and thereby stabilize the plastic deformation of the composite material. The findings imply that the room-temperature mechanical properties of bulk glassy alloy composites can be well tailored by selecting suitable reinforcers.
Graphic abstract |
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ISSN: | 0884-2914 2044-5326 |
DOI: | 10.1557/s43578-021-00199-1 |