Indentation response of multi-phase nanocrystalline NbWTi refractory multi-principal element alloy

被引：0
作者：
Jandhyala, N. L. [1 ]
Kalali, Deekshith G. [1 ]
Rajulapati, Koteswararao, V [2 ]
Rao, K. Bhanu Sankara [1 ]
机构：
[1] Univ Hyderabad, Sch Engn Sci & Technol, Hyderabad 500046, India
[2] Indian Inst Technol Hyderabad, Dept Mat Sci & Met Engn, Hyderabad 502285, India
来源：
MATERIALS LETTERS | 2024年 / 372卷
关键词：
Nanocrystalline materials; Refractory multi-principal element alloys; Ultra-high hardness; Indentation size effect; Deformation and fracture; HIGH-ENTROPY ALLOY; MECHANICAL-PROPERTIES; HIGH-STRENGTH; FRACTURE; NBMOTAW;
D O I：
10.1016/j.matlet.2024.137017
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
NbWTi refractory multi-principal element alloy has been synthesized using powder metallurgy route. 40 h of mechanical alloying resulted in a single-phase alloy and subsequent spark plasma sintering transformed it into a multi-phase structure (1 BCC and 2 FCC phases). The alloy demonstrated an extremely high hardness of 12.29 +/- 0.05 GPa at a load of 1000 g, along with excellent "density-normalized" hardness and indentation size effect. An indentation fracture toughness of 6.81 +/- 0.16 MPa.m1/2 was measured using the cracks generated. Ultra-high absolute hardness, high "density-normalized" hardness and associated fracture toughness signifies the potential of this alloy for next generation structural engineering applications.
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