The Positive Effect of Hydrogen Alloying on the Phase Tailoring and Mechanical Properties of Sintered Ti-13Nb SMAs


The effect of hydrogen alloying on phase tailoring and mechanical properties of the sintered Ti-13Nb (at pct) shape memory alloy (SMA) was investigated. It was found that hydrogen addition changed the microstructure of the sintered Ti-13Nb-(0-31)H (at pct) alloys gradually from α + β dual phase to single β phase due to the lowered transition temperature of β phase to α phase by hydrogen action. The reduction of α phase precipitation in the alloy reduced the amount of Nb squeezed out from the Nb-depleted α phase, and consequently decreased the mean Nb content in the β phase. Thus, the Ms temperature of Ti-13Nb alloy was successfully increased from lower temperature to near room temperature, which consequently enhanced the recoverable strain of the alloy by easier martensitic transformation. The sintered Ti-13Nb-18H alloy presented a Ms temperature of 22 °C and a remarkable recoverable strain of 3.9 pct at room temperature, which is the highest value ever reported in the sintered Ti-Nb based SMAs. Meanwhile, the Ti-13Nb-18H alloy exhibited a fracture strain of 23.1 pct and a fracture strength of 1321 MPa, both better than that of the Ti-13Nb alloy, which was attributed to the hydrogen atoms in the alloy which caused solid solution strengthening and also increased the content of the β phase with higher plasticity.

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The authors would like to acknowledge the financial support from Guangdong Provincial Science and Technology Projects (2016A030311012) and Key Laboratory of Advanced Energy Storage Materials of Guangdong Province.

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Correspondence to Y. Gao.

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Manuscript submitted March 26, 2019.

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Xu, Z., Yuan, B. & Gao, Y. The Positive Effect of Hydrogen Alloying on the Phase Tailoring and Mechanical Properties of Sintered Ti-13Nb SMAs. Metall Mater Trans A 50, 5525–5532 (2019).

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