Machine learning approach for predicting the fracture toughness of Nb Si based alloys

Ma, Eunho; Shin, Seung-Hyeok; Choi, Wonjune; Byun, Jongmin; Hwang, Byoungchul

doi:10.1016/j.ijrmhm.2023.106420

Cited by 5 publications

(1 citation statement)

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“…Ti hinders crack extension by lowering the Peierls–Nabarro energy barrier [ 12 ], while Hf and Mo increase the volume fraction of Nbss to improve fracture toughness [ 13 , 14 ]. However, as the number of alloying elements increases, it becomes difficult to accurately elucidate the correlation between the elemental composition and mechanical properties [ 15 ]. Furthermore, most elements have an unfavorable effect on the high-temperature performance due to the lower melting point than Nb [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Fracture Behavior and Mechanism of Nb-Si-Based Alloys with Heterogeneous Layered Structure

Wang,

Wang

et al. 2024

Materials

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Novel Nb-Si-based alloys with heterogeneous layers that have the same composition (Nb-16 at.%Si) but different phase morphologies were designed in this work. Heterogeneous layered structure (HLS) was successfully fabricated in Nb-16Si alloys by layering composite powders after various degrees of mechanical alloying (6 h, 12 h, 18 h, and 24 h) alternately and subsequent spark plasma sintering (SPS). The influence of HLS on the fracture behavior at both room and elevated temperature was investigated via single-edge notched bending (SENB) and high-temperature compression, respectively. The results show that the diversified HLS is obtained by combining hard layers containing fine equiaxed crystals and/or soft ones with coarse lamellar niobium solid solution (Nbss). By affecting the crack propagation in SENB, HLS is favorable for improving the fracture toughness and exhibits a significant increase compared with the corresponding homogenous microstructure. Moreover, for the same HLS, a more excellent performance is achieved when the initial crack is located in the soft layer and extended across the interface to the hard one through crack bridging, crack deflection, crack branching, and shielding effect. Fracture starts in the soft layer (from powders of ball-milled for 12 h) of a 12–24 alloy, and a maximum KQ value (14.89 MPa·mm1/2) is consequently obtained, which is 33.8% higher than that of the homogeneous Nb-16Si alloy. Furthermore, the heterogeneous layered alloys display superior high-temperature compression strength, which is attributable to the dislocation multiplication and fine-grained structure. The proposed strategy in this study offers a promising route for fabricating Nb-Si-based alloys with optimized and improved mechanical properties to meet practical applications.

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