Radiogenic ³He and High-Pressure Hydrogen Impact on Mechanical Properties and Structure of CrNi40MoCuTiAl Alloy

The paper presents research results related to the impact of high-pressure hydrogen (80 MPa) and radiogenic ³He and their synergetic effect on mechanical properties and structure of CrNi40MoCuTiAl alloy within the temperature range from room temperature to 873K.

The samples of three different ³He concentrations have been prepared for research: [approximately equal] 30, [approximately equal] 80 and [approximately equal] 190 appm. The buildup of ³He has been fulfilled using “tritium trick” technique.

The tests at room temperature have shown the increasing conventional yield strength (_0.2) and decreasing plasticity characteristics (total elongation ₅ and reduction of area ) depend on ³He concentration increasing. However at 873 K test temperature the alloy with the maximum ³He ([approximately equal] 190 appm) concentration turned out to be more plastic than the alloy with ³He [approximately equal] 30 and 80 appm concentration.