Effects of environment and temperature on the mechanical behavior of the Ni–19Si–3Nb–0.15B based intermetallic alloy with chromium addition

The effect of strain rate and temperature on the mechanical behavior of the Ni -18 Si -3.0 Nb -1.0 Cr -0.2 B alloy was investigated by atmosphere-controlled tensile testing in vacuum and air atmosphere at different strain rates and different temperatures. The results reveal that the Ni -18 Si -3.0 Nb -1.0 Cr -0.2 B alloy exhibits ductile mechanical behavior (UTS > 1200 MPa, ε > 8%) at room temperature under different atmosphere conditions. In addition, 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 973K. The elongation of the samples tested in vacuum and air for the Ni -18 Si -3 Nb -1 Cr -0.2 B alloy exhibits a significantly increase with temperature from 973K to 1073K. In addition, all fracture surfaces tested at 1073K in vacuum and air atmosphere presents a typical ductile fracture surface, a fully dimpled fracture pattern. The fact of increasing in elongation at high temperature (1073K) is suggested to be attributed by the dynamic recrystallization that occurs preferentially around the dispersion phase or grain boundaries and so as to enhance the ductility by reducing the stress concentration at or near grain boundaries.

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STRAIN RATE DEPENDENCE ON THE HIGH TEMPERATURE MECHANICAL BEHAVIOR OF THE NI-18SI-3.0NB-1.0CR-0.2B INTERMETALLIC ALLOY

Jang

Lee

et al. 2009

Int. J. Mod. Phys. B

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Microstructure and room temperature mechanical properties of Ni₃Si based alloy with titanium addition

Wang¹,

Fu²,

Cai³

et al. 2012

Materials Technology

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Dependence of Strain Rate and Environment on the Mechanical Properties of the Ni-19Si-3Nb-1Cr-0.2B Intermetallic Alloy at High Temperature

Chung

Chang

et al. 2007

MSF

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The results of atmosphere-controlled tensile test in various conditions (with different strain rate at different temperature under vacuum, air, or water vapor atmosphere) revealed that the addition of boron and chromium would improve the elongation as well as ultimate tensile strength (UTS) of the Ni-19Si-3Nb based alloys over a wide range of temperature under air and water vapor atmosphere. The UTS and elongation can reach to 1270 MPa and 14%, respectively at 873K in each kind of atmosphere. On contrary, the alloy without boron addition only presents ductile mechanical behavior in vacuum. This is evident that boron and Cr elements present positive effect on suppressing the environmental embrittlement in air and water vapor atmosphere from room temperature to 1073 K for the Ni-19Si-3Nb base alloy. In addition, both of UTS and elongation present quite insensitive on the strain rate when test at the temperature below 973 K. However, the UTS exhibits very dependent on the strain rate when test temperature above 973 K, decreasing the ultimate tensile strength with decreasing strain rate.

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Effects of environment and temperature on the mechanical behavior of the Ni–19Si–3Nb–0.15B based intermetallic alloy with chromium addition

Cited by 3 publications

References 34 publications

STRAIN RATE DEPENDENCE ON THE HIGH TEMPERATURE MECHANICAL BEHAVIOR OF THE NI-18SI-3.0NB-1.0CR-0.2B INTERMETALLIC ALLOY

STRAIN RATE DEPENDENCE ON THE HIGH TEMPERATURE MECHANICAL BEHAVIOR OF THE NI-18SI-3.0NB-1.0CR-0.2B INTERMETALLIC ALLOY

Microstructure and room temperature mechanical properties of Ni₃Si based alloy with titanium addition

Dependence of Strain Rate and Environment on the Mechanical Properties of the Ni-19Si-3Nb-1Cr-0.2B Intermetallic Alloy at High Temperature

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Effects of environment and temperature on the mechanical behavior of the Ni–19Si–3Nb–0.15B based intermetallic alloy with chromium addition

Cited by 3 publications

References 34 publications

STRAIN RATE DEPENDENCE ON THE HIGH TEMPERATURE MECHANICAL BEHAVIOR OF THE NI-18SI-3.0NB-1.0CR-0.2B INTERMETALLIC ALLOY

STRAIN RATE DEPENDENCE ON THE HIGH TEMPERATURE MECHANICAL BEHAVIOR OF THE NI-18SI-3.0NB-1.0CR-0.2B INTERMETALLIC ALLOY

Microstructure and room temperature mechanical properties of Ni3Si based alloy with titanium addition

Dependence of Strain Rate and Environment on the Mechanical Properties of the Ni-19Si-3Nb-1Cr-0.2B Intermetallic Alloy at High Temperature

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Microstructure and room temperature mechanical properties of Ni₃Si based alloy with titanium addition