Microstructure and mechanical properties of lightweight Ti3Zr1.5NbVAl (x = 0, 0.25, 0.5 and 0.75) refractory complex concentrated alloys

Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures

“…Therefore, lightweight MPEAs containing a high Ti content have been widely reported. For example, Ti 65 (AlCrNb) 35 [ 21 ], Ti 3.6 Al 0.3 Zr 1.2 V 0.8 [ 18 ], and Ti 3 Zr 1.5 NbVAl x [ 22 ] alloys display high tensile strength beyond 750 MPa and ductility of at least 10%. In the present work, Ti70 and Ti80 MPEAs were designed and studied.…”

“…Figure 4 shows the specific yield strength and density of the current MPEAs compared with those of reported HEAs and titanium alloys [ 3 , 6 , 18 , 22 , 29 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. The density of the current alloys is lower than that of most reported HEAs and is similar to titanium alloys.…”

“…The selected area diffraction (SAED) pattern along the [001] zone axis confirmed a BCC phase structure, and another B2 phase was available. According to the similar composition, the appearance of the B2 phase was related to the high Al content [ 22 ]. Figure 5 c shows the BF TEM image of Ti70 alloys after plastic deformation at 77 K, and it can be obtained that the dislocation density was lower compared to that at 298 K. According to previous reports, low temperature increases the critical resolved shear stress (CRSS) of dislocation slips and makes dislocation movement difficult, resulting in an increase of the strength of the alloys [ 44 ].…”

Effect of Mn content on microstructure and properties of AlCrCuFeMnx high-entropy alloy

“…Combined with the analysis above, in the AlCrCuFeMn x (x=0, 0.5, 1, 1.5, 2) high-entropy alloys, when the Mn increases, the AlCuMn-rich FCC phase starts to increase and the FeCr-rich BCC phase gradually decreases, which results in a general trend of decreasing yield strength and increasing plasticity. However, when the Mn content increases, the area fraction of the precipitated phase in the alloy gradually increases and the size of the precipitated phase is larger in AlCrCuFeMn 1 and AlCrCuFeMn 1.5 compared to AlCrCuFeMn 0.5 alloy, therefore, when x increases from 0.5 to 1.5, the strengthening effect of the precipitated phase on the alloy is enhanced, resulting in a significant increase in the yield strength of the alloy [31] .…”