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Microstructure and mechanical properties of Ti3V2NbAlxNiy low-density refractory multielement alloys
Intermetallics ( IF 4.3 ) Pub Date : 2021-03-24 , DOI: 10.1016/j.intermet.2021.107187
Hongwei Yao , Yongmiao Liu , Xianhu Sun , Yiping Lu , Tongmin Wang , Tingju Li

This study aimed to develop a novel series of low-density refractory high-entropy alloys (RHEAs) by precipitation strengthening. The design ideas of high-entropy alloys and titanium alloys were combined to develop Ti3V2NbAl0.5, Ti3V2NbNi0.5, and Ti3V2NbAl0.5Ni0.5 refractory multielement alloys. These alloys displayed low densities of 5.39, 5.83, and 5.55 g/cm3, respectively. The effects of Al and Ni addition on the microstructure and mechanical properties were investigated. Thereinto, the Ti3V2NbAl0.5 with a body-centered cubic structure had a yield strength of 760 MPa, and the compressive strain exceeded 50%. The Ti3V2NbNi0.5 alloy strengthened by large C15 Laves-phase particles in the interdendritic regions exhibited a high yield strength of 1130 MPa but with a limited compressive strain of 20%. By contrast, the Ti3V2NbAl0.5Ni0.5 alloy had a high yield strength of 1250 MPa and acceptable strain of 40%, benefiting from the precipitation of fine C14 Laves-phase particles and twined B19’ martensite. Moreover, the specific yield strength (SYS) of the Ti3V2NbAl0.5Ni0.5 alloy was 223 kPa·m3kg−1, superior to most other reported RHEAs at room temperature. It remained a high SYS of 198 and 54 kPa·m3kg−1 at 700 and 800 °C, respectively, which shows a superior balance between its density and mechanical properties across a wide temperature range.



中文翻译:

Ti 3 V 2 NbAl x Ni y低密度难熔多元合金的组织和力学性能

这项研究旨在通过沉淀强化来开发一系列新的低密度耐火高熵合金(RHEA)。结合高熵合金和钛合金的设计思想,开发出Ti 3 V 2 NbAl 0.5,Ti 3 V 2 NbNi 0.5和Ti 3 V 2 NbAl 0.5 Ni 0.5难熔多元合金。这些合金分别显示出5.39、5.83和5.55g / cm 3的低密度。研究了铝和镍的添加对组织和力学性能的影响。其中,Ti 3 V 2 NbAl以体心立方结构为0.5的屈服强度为760MPa,压缩应变超过50%。在枝晶间区域中由大的C15 Laves相颗粒增强的Ti 3 V 2 NbNi 0.5合金具有1130 MPa的高屈服强度,但压缩应变有限,仅为20%。相比之下,受益于细小的C14 Laves相颗粒和孪生B19'马氏体的析出,Ti 3 V 2 NbAl 0.5 Ni 0.5合金具有1250 MPa的高屈服强度和40%的可接受应变。此外,Ti 3 V 2 NbAl 0.5的比屈服强度(SYS)Ni 0.5合金为223 kPa·m 3 kg -1,在室温下优于大多数其他已报道的RHEA。它 在700和800°C时分别保持198和54 kPa·m 3 kg -1的高SYS ,这显示出在宽温度范围内其密度与机械性能之间的出色平衡。

更新日期:2021-03-24
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