Hypervelocity impact damage to Ti–6Al–4V meshes reinforced Al–6Mg alloy matrix composites

Zhu, Di; Chen, Guoqin; Wu, Guanglei; Kang, Pengchao; Ding, Wenjiang

doi:10.1016/j.msea.2008.09.029

Cited by 12 publications

References 13 publications

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Interface Characteristics and Dynamic Compression Behaviors of Al₃₅Ti₁₅Cr₂₀Mn₂₀Cu₁₀ High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

et al. 2022

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Lightweight high‐entropy alloys (LWHEAs) become the research hotspot and are ideal reinforcement materials for aluminum matrix composites (AMCs). The 0, 5, and 10 vol% lightweight Al35Ti15Cr20Mn20Cu10 HEA/6061Al (HEA/Al) composites are fabricated by spark plasma sintering (SPS). The HEA–Al interfacial characteristics, dynamic compression behaviors, and failure mechanism of the composites are studied. Results show that Al35Ti15Cr20Mn20Cu10 LWHEA possesses body‐centered cubic (BCC) and face‐centered cubic (FCC) dual‐phase structures. The interfacial diffusion layer of HEA/Al is characterized as α‐Al (FCC phase) dissolved by Cr, Mn, and Si atoms, with a thickness of about 0.6 1. During dynamic compression, the introduction of Al35Ti15Cr20Mn20Cu10 LWHEA particles significantly improves the strain‐rate sensitivity of 6061Al alloy. Among them, the strain‐rate sensitivity coefficient of 10 vol% HEA/Al composites is 0.02, about four times that of the aluminum alloy matrix. Different from the micro‐failure controlled by interfacial‐debonding for AMCs reinforced by ceramic particles, the failures of HEA/Al composites are dominated by the breakage of LWHEA particles and micro‐cracks formed in the matrix, while interfacial‐debonding is rarely observed in the diffusion layers. It is concluded that a strong‐binding HEA–Al interface can effectively restrain the rapid propagation of cracks in the composites suffered by impact load.

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Interface Characteristics and Dynamic Compression Behaviors of Al₃₅Ti₁₅Cr₂₀Mn₂₀Cu₁₀ High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

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Strain-rate sensitivity of aluminum 2024-T6/TiB2 composites and aluminum 2024-T6

Zhu

Zheng

Chen

2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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We study best-arm identification (BAI) in the fixed-budget setting. Adaptive allocations based on upper confidence bounds (UCBs), such as UCBE, are known to work well in BAI. However, it is well-known that its optimal regret is theoretically dependent on instances, which we show to be an artifact in many fixed-budget BAI problems. In this paper we propose an UCB exploration algorithm that is both theoretically and empirically efficient for the fixed budget BAI problem under a Bayesian setting. The key idea is to learn prior information, which can enhance the performance of UCB-based BAI algorithm as it has done in the cumulative regret minimization problem. We establish bounds on the failure probability and the simple regret for the Bayesian BAI problem, providing upper bounds of order Õ( K/n), up to logarithmic factors, where n represents the budget and K denotes the number of arms. Furthermore, we demonstrate through empirical results that our approach consistently outperforms state-of-the-art baselines.

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Experimental Methods

Meyer¹,

Pursche²

2012

Adiabatic Shear Localization

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Hypervelocity impact damage to Ti–6Al–4V meshes reinforced Al–6Mg alloy matrix composites

Cited by 12 publications

References 13 publications

Interface Characteristics and Dynamic Compression Behaviors of Al₃₅Ti₁₅Cr₂₀Mn₂₀Cu₁₀ High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

Interface Characteristics and Dynamic Compression Behaviors of Al₃₅Ti₁₅Cr₂₀Mn₂₀Cu₁₀ High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

Strain-rate sensitivity of aluminum 2024-T6/TiB2 composites and aluminum 2024-T6

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Hypervelocity impact damage to Ti–6Al–4V meshes reinforced Al–6Mg alloy matrix composites

Cited by 12 publications

References 13 publications

Interface Characteristics and Dynamic Compression Behaviors of Al35Ti15Cr20Mn20Cu10 High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

Interface Characteristics and Dynamic Compression Behaviors of Al35Ti15Cr20Mn20Cu10 High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

Strain-rate sensitivity of aluminum 2024-T6/TiB2 composites and aluminum 2024-T6

Experimental Methods

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Product

Resources

About

Interface Characteristics and Dynamic Compression Behaviors of Al₃₅Ti₁₅Cr₂₀Mn₂₀Cu₁₀ High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering

Interface Characteristics and Dynamic Compression Behaviors of Al₃₅Ti₁₅Cr₂₀Mn₂₀Cu₁₀ High‐Entroy Alloy/6061Al Composites Fabricated by Spark Plasma Sintering