Effect of strain rate and environment on the mechanical properties of the Ni–19Si–3Nb–0.15B–0.1C intermetallic alloy at high temperatures |
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Authors: | C C Fu J S C Jang L J Chang T Y Lin C M Kuo |
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Affiliation: | (1) Department of Materials Science & Engineering, I-Shou University, Kaohsiung, Taiwan, ROC;(2) Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung, Taiwan, ROC |
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Abstract: | The effect of strain rate and environment on the mechanical behavior at different temperatures of the Ni–19Si–3Nb–0.15B–0.1C
alloy is investigated by atmosphere-controlled tensile testing under various conditions at different strain rates and different
temperatures). The results reveal that the Ni–19Si–3Nb–0.15B–0.1C alloy exhibits ductile mechanical behavior (UTS ∼ 1250 MPa,
ε ~ 14%) at temperatures below 873 K under different atmosphere conditions. However, the alloy without boron and carbon addition
shows ductile mechanical behavior only when the sample is tested in vacuum. This indicates that the microalloying of boron
and carbon does overcome the environmental embrittlement from water vapor at test temperatures below 873 K for the Ni–19Si–3Nb
base alloy. However, the boron and carbon doped alloy still suffers from embrittlement associated with oxygen at a medium
high temperature (i.e. 973 K). In parallel, both of the ultimate tensile strength and elongation exhibit quite insensitive
response with respect to the loading strain rate when tests are held at temperatures below 873 K. However, the ultimate tensile
strength exhibits high dependence on the strain rate in air at temperatures above 873 K, decreasing the ultimate tensile strength
with decreasing strain rate. |
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