Effect of Ambient Temperature on Mechanical Properties of As-cast Ti₄₉Ni₅₁ Shape Memory Alloy AITranslate

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Chinese Library Classification Number:TG139.6[一般工业技术—材料科学与工程]

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The phase transformation of as-cast Ti₄₉Ni₅₁ alloy samples was tested by differential scanning ca-lorimeter(DSC),and their mechanical properties were tested by cyclic loading and unloading on universal testing machine under the conditions of two ambient temperatures(303Kand 323K)and three strains(6%,7%and 7.5%).The results show that there is no martensite transformation platform or reverse martensite transformation platform during the loading and unloading of the samples at the ambient tempe-ratures of 303Kand 323Kand the strains of 6%,7%and 7.5%.The dissipated energy(W_d) is related to the ambient temperature.When the ambient temperature(303K)is in the stage of martensite transformation,the sample has a relatively large value of dissipated energy W_d during the cyclic loading and unloading with the strains of 6%,7%and 7.5%.However,when the ambient temperature(323K) is in the unstable stage of austenite transformation,the samples with the strains of 6% and 7%have relatively small W_d values during the loading and unloading.In addition,at the ambient temperatures of 303Kand 323K,the change of the recoverable strain energy density W_r value is small with the smaller strain(6%),and tends to be stable with the increase of the cycle number,while the W_r value is less stable or does not show a stable value with the larger strain(7.5%).