【摘 要】
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Super-high strength NbTaTiZr high-entropy alloys (NbTaTiZr HEAs) have been successfully fabricated by the mechanical alloying (MA) with spark plasma sintering (SPS) technology,which is 2-fold compared with that of NbTaTiZr HEAs prepared by vacuum arc melt
【机 构】
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School of Materials Science and Engineering,Harbin Institute of Technology (Shenzhen),Shenzhen 51805
论文部分内容阅读
Super-high strength NbTaTiZr high-entropy alloys (NbTaTiZr HEAs) have been successfully fabricated by the mechanical alloying (MA) with spark plasma sintering (SPS) technology,which is 2-fold compared with that of NbTaTiZr HEAs prepared by vacuum arc melting (VAM).After the SPS process,the bulk NbTa-TiZr alloy samples are provided with dual-phase body-centered cubic (BCC) structure and nanoscale grain size about 500 nm that is obviously smaller than that of NbTaTiZr HEA fabricated by VAM.When the sin-tering temperature is 800 ℃,the compressive fracture strength is the highest reaching at 2511 ± 78 MPa.When the sintering temperature is 1000 ℃,the fracture strain is the highest reaching at 12.8％,and com-pressive fracture strength and yield strength also reach at 2274 ± 91 MPa and 2172 ± 47 MPa,respec-tively.The excellent mechanical properties of bulk NbTaTiZr alloy samples are attributed to the merits of MA and SPS,and the collaboration effect of ultra-fine grains strengthening,solid solution strengthening and interstitial solid solution strengthening.
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