Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite

Han, Baoshuai; Xu, Yanjin; Guo, Enyu; Jing, Tao; Hou, Hongliang; Luo, Liangshun

doi:10.1007/s40195-018-0727-3

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…Furthermore, XRD characterization demonstrates the above results, shown in Figure 5b. As mentioned by some previous papers [18,24,25], solid Ti and liquid Al had the abilities to react with each other to form some intermetallic compounds such as Al 3 Ti, Al 2 Ti, TiAl, Ti 2 Al 5 , and Ti 3 Al. Thermodynamic calculation on the Gibbs formation free-energy of these aluminides indicates that Al 3 Ti has relatively lower formation free-energy among the compounds mentioned above during the temperature range of 0–800 °C [26,27].…”

Section: Resultsmentioning

confidence: 99%

In-Situ Observation of Fracture Behavior of Ti-Aluminide Multi-Layered Composites Produced by a Hybrid Sintering Process

Wan

Zhu

et al. 2019

Materials

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The fabrication of Ti-aluminide multi-layered composites have attracted great attention for their excellent mechanical properties, such as high specific strength, high specific stiffness, tolerable toughness, and low density. The preparation of the composite produced by a hybrid procedure composed of Vacuum Hot Pressing (VHP) and Hot Isostatic Pressing (HIP) using Ti foils and Al foils has been performed. Further, X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray Spectrometry (EDXS) were carried out to identify the microstructure and phase formation of the composite. In addition, an in-situ three-point bending test was conducted on the notched specimen to observe the crack propagation behavior carefully. The results indicate that the densified composite was obtained without any apparent voids and pores which could undesirably develop into the source of cracks. Furthermore, all the pure Al foils were totally consumed to form a series of the Ti-Al compounds through the diffusive reaction between the adjacent Ti and Al foils. Moreover, the in-situ observation demonstrates the initiation and propagation of cracks in the intermetallic layers and the role of residual Ti layers to blunt and bridge the cracks by their plastic deformation. This study provides a new strategy for fabricating the Ti-aluminide multi-layered composites.

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Section: Resultsmentioning

confidence: 99%

In-Situ Observation of Fracture Behavior of Ti-Aluminide Multi-Layered Composites Produced by a Hybrid Sintering Process

Wan

Zhu

et al. 2019

Materials

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“…In February 2021, the government reallocated a budget of Rp. 699,43 trillion (around US $ 49,3 billion) for the continuation of the PEN program this year [22]. Indonesia continues to strengthen social protection programs to respond to the crisis caused by this pandemic.…”

Section: The Function Of Turtle With Reference To Hahslm In the Era O...mentioning

confidence: 99%

Constant 12 and Hahslm 472319 as Universe Creation Code on Tortoise Shell in Covid Economic Era

Aziz¹

2022

Advances in Biological Sciences Research

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The purpose of this study is to analyze the meaning contained in the morphology of the tortoise carapace and plastron using an Islamic approach in the Covid pandemic situation and the simultaneous economic and social crisis. The objects in this study include tortoises, the sociological impacts of the economy due to Covid and their relationship with the theory of H and the Al-Qur'an. Meanwhile, the methodology that will be used in this research is reflexivity and similarity in which the method is to investigate the linkages of the factors that have been mentioned. If you look at its origins, the tortoise shell which has this unique shape makes it an interesting animal to study in the field of vertebrate biology. In this study, the authors will focus on tortoise carapace and plastron. The results obtained in this study are if the tortoise carapace which has a scute of 3 and 1.9 can reflect the values contained in the meaning of Islam, this is evidenced in the Hahslm number 472319. In addition, the marginal number itself has a total scute 24 and 1 nuchal, so can get 7 digits in the numbers 2 + 4 + 1 = 7.

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“…Continuous SiC fiber-reinforced titanium matrix alloy composites (TMC) are promising materials for high-temperature structural applications due to their excellent mechanical properties such as high specific stiffness and specific strength [1]. Matrix alloys that can be used for TMC materials include (α + β) type [2][3][4], metastable β type [5] and near α type [6], as well as γ-TiAl [7][8][9] as α2-Ti 3 Al [10,11]. Among these matrix alloys, γ-TiAl possesses the best comprehensive mechanical properties at elevated temperature [12,13]; therefore, SiC fiber-reinforced γ-TiAl composite materials can be used at higher temperature compared to the other TMCs, and they were considered to be one of the most promising aerospace materials [7,14].…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of SiC Fiber-Reinforced γ-TiAl Composites Prepared by Suction Casting

Shen

Jia

Zhang

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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The process of preparing SiC fiber-reinforced γ-TiAl composites by the conventional methods is difficult and complicated due to the high reactivity, high melting point and poor deformability of γ-TiAl alloys. In this work, suction casting, a promising method for preparing SiC f /TiAl composite, had been attempted. In the process, γ-TiAl alloy melt was introduced rapidly into a mold within pre-arranged fibers that were coated with additional layer of titanium alloy. This simple method successfully prevented serious reactions between the alloy melt and the fibers which remained intact during the solidification process. The interfacial reaction layer was observed by optical microscopy, scanning electron microscopy (SEM). The interfacial reaction products were identified by transmission electron microscopy (TEM). Tensile tests of the matrix alloy and composites were performed at room temperature and 800 °C. The results exhibited that the tensile strength of SiC f /γ-TiAl composite was higher than that of the matrix alloy at both room temperature and 800 °C. At room temperature, tensile strength of SiC f /γ-TiAl composite was increased by about 7% (50 MPa), whereas a double increase in tensile strength 14% (100 MPa) was obtained at 800 °C. The titanium alloy coating on the fiber not only prevented the serious interfacial reaction between the γ-TiAl alloy melt and the SiC fiber, but also played a role in delaying the propagation of cracks in the matrix to the fiber at 800 °C. The fracture mechanism of the composite was analyzed by fracture metallographic analysis.

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Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite

Cited by 6 publications

References 47 publications

In-Situ Observation of Fracture Behavior of Ti-Aluminide Multi-Layered Composites Produced by a Hybrid Sintering Process

In-Situ Observation of Fracture Behavior of Ti-Aluminide Multi-Layered Composites Produced by a Hybrid Sintering Process

Constant 12 and Hahslm 472319 as Universe Creation Code on Tortoise Shell in Covid Economic Era

Tensile Behavior of SiC Fiber-Reinforced γ-TiAl Composites Prepared by Suction Casting

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