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Structure and mechanical properties of B2 ordered refractory AlNbTiVZr_x (x = 0-1.5) high-entropy alloys

机译:B2有序耐火AlNbTiVZr_x(x = 0-1.5)高熵合金的结构和力学性能

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Structure and mechanical properties of the AlNbTiVZr_x (x = 0; 0.1; 0.25; 0.5; 1; 1.5) refractory high-entropy alloys were investigated after arc melting and annealing at 1200 ℃ for 24 h. The AINbTiV alloy had a B2 ordered single phase structure. Alloying with Zr resulted in (i) change of the degree of order of the B2 phase; and (ii) precipitation of the Zr_5Al_3 and C14 Laves ZrAlV phases. The density of the AlNbTiVZr_x alloys varied from 5590 kg m~(-3) for the AINbTiV alloy to 5870 kg m~(-3) for the AlNbTiVZr_(1.5) alloy. The compression yield strength at 22 ℃ increased with an increase in the Zr content from 1000 MPa for the AINbTiV alloy to 1535 MPa for the AlNbTiVZr_(1.5) alloy. The plasticity raised from 6% for the AINbTiV alloy to > 50% for the AlNbTiVZr_(0.5) alloy and then dropped to 0.4% for the AlNbTiVZr_(1.5) alloy. At 600 ℃, the strongest alloy was also the AINbTiVZr_(1.50, whereas, at 800 ℃, the AlNbTiVZr_(0.1) alloy demonstrated the maximum strength. The plasticity of the AINbTiV alloy at 600 ℃ increased up to 14.3%, while the Zr-containing alloys had lower plasticity. At 800 ℃, all the AlNbTiVZr_x alloys could be plastically deformed up to 50% of strain without fracture. Ordering in the alloys and the reasons of a complicated dependence of mechanical properties of the AlNbTiVZr_x alloys on the Zr content and temperature were discussed.
机译:电弧熔化并在1200℃退火24 h后,研究了AlNbTiVZr_x(x = 0; 0.1; 0.25; 0.5; 1; 1.5)难熔高熵合金的组织和力学性能。 AINbTiV合金具有B2有序的单相结构。与Zr合金化导致(i)B2相的有序度改变; (ii)Zr_5Al_3和C14 Laves ZrAlV相的沉淀。 AlNbTiVZr_x合金的密度从AINbTiV合金的5590 kg m〜(-3)到AlNbTiVZr_(1.5)合金的5870 kg m〜(-3)不等。随着Zr含量的增加,在22℃时的压缩屈服强度从AINbTiV合金的1000 MPa增加到AlNbTiVZr_(1.5)合金的1535 MPa。可塑性从AINbTiV合金的6%提高到AlNbTiVZr_(0.5)合金的> 50%,然后下降到AlNbTiVZr_(1.5)合金的0.4%。在600℃时,最强的合金也是AINbTiVZr_(1.50),而在800℃时,AlNbTiVZr_(0.1)合金表现出最大的强度;在600℃时AINbTiVZr_(0.1)合金的塑性提高了14.3%,而Zr-含合金的塑性较低,在800℃时,所有的AlNbTiVZr_x合金在不超过50%应变的情况下均可塑性变形,合金中的有序化以及AlNbTiVZr_x合金的机械性能对Zr含量和温度进行了讨论。

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