| Mechanical properties of zircaloy-4 alloy containing 10ppm to 2500ppm hydrogen have investigated in the range of 25℃ to 700℃ at a strain rate of 6.7×10^(-4)sec^(-1). Up to 500℃, ultimate and yield strength are increased as the hydrogen content increases, but the trend is opposite at 700℃. Total elongation of the alloy are not sensitive to the temperature up to 400℃ but they increase rapidly from 550℃ and uniform elongation have a peak value at 200℃. True stress-true plastic strain curve of the alloy are divided into two stages below 400℃, except the alloy containing 2500ppm hydrogen, and each of which can be represented by the Ludwik equation; σ=σ_0+Kεⁿ. Strain hardening exponent, n₁, of the first stage, in general, decreased as the hydrogen content and temperature increase. |
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