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| 1 | Remarkably high fracture toughness of HfNbTaTiZr refractory high-entropy alloy显示文摘High-entropy alloys(HEAs)with face-centered cubic(FCC)phase such as CoCrFeMnNi or CoCrNi generally exhibit ultra-high fracture toughness but relatively low strength.In contrast,body-centered cubic(BCC)HEAs often display higher strengths,but the few reports on fracture toughness measurement demonstrate low toughness values.Here we show that the BCC HfNbTaTiZr refractory HEA,which possesses a combination of high strength,good tensile ductility and excellent high-temperature properties,also exhibits a remarkably high fracture toughness.By using the'single specimen'compliance method for J-integral measurement according to the ASTM E1820–17 standard,its fracture toughness K_(JIC)was experimentally determined to be 210 MPa m^(1/2),which renders this HEA among the toughest metallic materials.The excellent damage tolerance makes the HEA promising for applications as high-temperature structural materials such as in aerospace field. | X.J.Fan R.T.Qu Z.F.Zhang | 2022 | Journal of Materials Science & Technology2022，，28： | 1 |
| 2 | Intrinsic Strength Asymmetry Between Tension and Compression of Perfect Face-Centered-Cubic Crystals显示文摘The strength asymmetry between tension and compression is a typical case of mechanical response of materials.Here we achieve the intrinsic strength asymmetry of six face-centered-cubic perfect crystals(Cu,Au,Ni,Pt,Al and Ir)through calculating the ideal tensile and compressive strength with considering the normal stress effect and the competition between different crystallographic planes.The results show that both the intrinsic factors(the ideal shear strength and cleavage strength of low-index planes)and the orientation could affect the strength asymmetry,which may provide insights into understanding the strength of ultra-strong materials. | R.F.Wang J.Xu R.T.Qu Z.Q.Liu Z.F.Zhang | 2016 | Acta Metallurgica Sinica(English Letters)2016，29，8： | 0 |
| 3 | Designing metallic glasses with optimal combinations of glass-forming ability and mechanical properties显示文摘It is a long-standing challenge to search for metallic glasses(MGs)with optimal combinations of glassforming ability(GFA),strength and toughness in the vast compositional space.By taking into account both recently developed ellipse criterion and temperature-based GFA criterion,here we established quantitative correlations among compositions,elastic constants,GFA and mechanical properties of MGs,which enable to predict the GFA,fracture strength and fracture surface simultaneously in advance once the compositions of MGs are determined.Experimental data confirm the validity of this approach in prediction.Finally,a strategy for designing MGs with optimal combinations of strength,toughness and GFA is proposed,which allows for high-throughput discovering glass formers with excellent mechanical properties. | S.J.Wu Z.Q.Liu R.T.Qu Z.F.Zhang | 2021 | Journal of Materials Science & Technology2021，，8： | 0 |
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