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Effect of hydrogen as a temporary β stabilizer on microstructure and brittle fracture behavior in a titanium aluminide alloy

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Abstract

Microstructures of Ti-24A1-11Nb were solution treated in either the α2 + β or β phase field under vacuum or hydrogen gas, followed by air (AC), furnace (FC), or controlled cooling (CC), and then aged or outgassed at 800°C. All mechanical tests were on hydrogen-free specimens. If 1147 °C β solution treatment (ST) was followed by AC, hydrogen as a temporary β stabilizer clearly decreased the size of the α2 phase and increased greatly the retained or transformed β phase content. As a result, room-temperature tensile strength, fracture strength (σ F ), ductility (ε f ), and fracture toughness(K Ic ) resulting from 1147 °C solution treating in hydrogen increased by 120, 100, 60, and 42 pct, respectively, as compared with that under vacuum. If β ST was followed by FC, hydrogen as a β stabilizer increased only the β phase content but did not decrease the size of α2 phase or colony; and made ultimate tensile strength (UTS), σ f , ε f , andK Ic increase only moderately. Cooling from the α2 + β phase field (1000 °C or 1075 °C), hydrogen as a β stabilizer changed the size of transformed α2 phase and σ f , ε f , andK Ic increased slightly. Properties were also a function of crosshead speed. For all microstructures, α2/β boundaries appeared to be effective barriers to slip and crack initiation.

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Authors and Affiliations

  1. Department of Materials Physics, Beijing University of Science and Technology, 100083, Beijing, People’s Republic of China

    Wu-Yang Chu (Professor)

  2. Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University, 15213, Pittsburgh, PA

    Anthony W. Thompson (Professor)

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  1. Wu-Yang Chu
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  2. Anthony W. Thompson
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formerly Visiting Professor, Carnegic Mellon University

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Chu, WY., Thompson, A.W. Effect of hydrogen as a temporary β stabilizer on microstructure and brittle fracture behavior in a titanium aluminide alloy. Metall Trans A 22, 71–81 (1991). https://doi.org/10.1007/BF03350950

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