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Ti50Ni501xFex shape memory alloys (SMAs) have higher inherent and intrinsic internal friction peaks during R 1⁄4 B19A transformation ((IFPT + IFI)R1⁄419A) than during B21⁄4 R transformation ((IFPT + IFI)B21⁄4R). The reasons are that the former has the larger transformation strain and the abundant movable twin boundaries appearing in both R-phase and transformed B19A martensite. Ti50Ni501xFex SMAs also exhibit higher (IFPT + IFI)R1⁄419A peaks than annealed Ti50Ni50 SMA after cold-rolling because the latter needs dislocations to be introduced to form R-phase, but the former does not. For Ti50Ni48Fe2 SMA, the tan ¤ values of the (IFPT + IFI)B21⁄4R and (IFPT + IFI)R1⁄4B19A peaks and that of IFI in the Rphase regime decrease after the dehydrogenation treatment at 600°C for 6 h in a vacuum furnace, due to pinning of the twin boundaries by hydrogen atoms. However, the hydrogen pinning effect is small for IFI in B2 phase and B19A martensite. Ti50Ni501xFex SMAs with x = 2 and 3 at% have quite good (IFPT + IFI)R1⁄419A tan ¤ values (> 0.035), but their low transformation temperatures may restrict their use in practical highdamping applications. [doi:10.2320/matertrans.M2015425]

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Damping Characteristics of the Inherent and Intrinsic Internal Friction of Ti&lt;sub&gt;50&lt;/sub&gt;Ni&lt;sub&gt;50&amp;minus;&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Fe&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt; (&lt;i&gt;x&lt;/i&gt; = 2, 3, and 4) Shape Memory Alloys