首页|TiZrHfNb refractory high-entropy alloys with twinning-induced plasticity
TiZrHfNb refractory high-entropy alloys with twinning-induced plasticity
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The twinning-induced plasticity(TWIP)effect has been widely utilized in austenite steels,β-Ti alloys,and recently developed face-centered-cubic(FCC)high-entropy alloys(HEAs)to simultaneously enhance the tensile strength and ductility.In this study,for the first time,the TWIP effect through hierarchical{332<113>mechanical twinning has been successfully engineered into the TiZrHfNb refractory HEAs by decreasing temperature and tailoring the content of Nb to destabilize the BCC phase.At cryogenic tem-perature,the comprehensive hierarchical {332}<113>mechanical twins are activated in TiZrHfNb0.5 alloy from micro-to nanoscale and progressively segment the BCC grains into nano-scale islands during de-formation,ensuring sustainable strain hardening capability and eventually achieving a substantial 35％uniform tensile elongation.In addition,at 77 K,the tensile strength and uniform elongation of TiZrHfNbx alloys can further be adjusted by a moderate increase of Nb.The results above shed new light on the de-velopment of high-performance refractory HEAs with a high and adjustable strength and ductility com-bination down to the cryogenic temperature.
Shubin Wang、Da Shu、Peiying Shi、Xianbing Zhang、Bo Mao、Donghong Wang、Peter.K.Liaw、Baode Sun
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Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China
Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China
Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN,37996,USA
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of ChinaNational Science FoundationNational Science FoundationNational Science FoundationUS Army Research OfficeUS Army Research Office
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