Ti/B4C Composites Prepared by In Situ Reaction Using Inductive Hot Pressing

2017 ◽  
Vol 742 ◽  
pp. 121-128 ◽  
Author(s):  
Enrique Ariza Galván ◽  
Isabel Montealegre-Meléndez ◽  
Cristina Arévalo ◽  
Michael Kitzmantel ◽  
Erich Neubauer
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Manufacturing Process ◽  
Processing Conditions ◽  
Microstructure And Properties ◽  
Microstructure Observation ◽  
Suitable Processing

In the present work, in situ reinforced titanium composites (TMCs) synthesized using inductive hot pressing (iHP) are studied. The effects of B4C phases and applied processing conditions, on the microstructure and properties of TMCs, are investigated. With the addition of B4C particles, the microstructure of TMCs is refined and the strength is improved.Products of reactions which occur during the manufacturing process are analysed in detail. Microstructure observation illustrates, that B4C survives - depending on the processing conditions. The reinforcing phases are homogeneously distributed in Ti matrix. Moreover, results of densification, mechanical properties and hardness measurements help to identify the most suitable processing conditions to produce this kind of TMCs.

scholarly journals Fabrication and mechanical properties of self-toughening ZrB2–SiC composites from in-situ reaction

2019 ◽  
Vol 8 (4) ◽  
pp. 527-536 ◽  
Author(s):  
Zhaofu Zhang ◽  
Jianjun Sha ◽  
Yufei Zu ◽  
Jixiang Dai ◽  
Yingjun Liu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Hot Pressing ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Microstructure Observation ◽  
Pull Out ◽  
Sic Composites ◽  
Reactive Hot Pressing

AbstractSelf-toughening ZrB2–SiC based composites are fabricated by in-situ reactive hot pressing. The effect of sintering additive content on the microstructure and mechanical properties of the composites is investigated. Microstructure observation found that the in-situ reactive hot pressing could promote the anisotropic growth of ZrB2 grains and the formation of interlocking microstructure. Such microstructure could improve the mechanical properties, especially, for the fracture toughness. The improved mechanical properties could be attributed to the self-toughening structure related to the ZrB2 platelets and the formed interlocking microstructure, which could trigger various toughening mechanisms such as grain pull-out, crack bridging, crack deflection, and crack branching, providing the main contribution to the high fracture toughness.

scholarly journals Fabrication, Microstructure, and Properties of In Situ V2C-Reinforced Copper Composites

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1829
Author(s):  
Yu Quan ◽  
Baotong Hu ◽  
Shuai Fu ◽  
Detian Wan ◽  
Yiwang Bao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Physical And Mechanical Properties ◽  
Microstructure And Properties

In this paper, in situ V2C-reinforced Cu composites were successfully fabricated by hot pressing at 750 °C under 25 MPa using Cu and V2SnC powders. Due to decomposition of V2SnC to V2C and Sn during sintering, Sn atoms entered the crystal structure of Cu. Therefore, final compositions of composites consisted of Cu(Sn) and V2C phases. Here, copper composites with 0, 5, 10, 20, and 30 vol.% V2C were designed. Their microstructures and physical and mechanical properties were systematically investigated. It was observed that with increasing V2C content, electrical conductivity decreased from 0.589 × 108 S·m−1 to 0.034 × 108 S·m−1 and thermal conductivity decreased from 384.36 W⋅m−1⋅K−1 to 24.65 W·m−1·K−1, while Vickers hardness increased from 52.6 HV to 334 HV. Furthermore, it was found that composites with 20 vol.% V2C had the highest tensile strength (440 MPa).

Studies on Mechanical Properties of Mulberry Branches Scrimber

2013 ◽  
Vol 842 ◽  
pp. 486-488
Author(s):  
Mei Ling Chen ◽  
Chuan Gui Wang ◽  
Shuang Yan Zhang ◽  
Heng Wu ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Manufacturing Process ◽  
Urea Formaldehyde ◽  
Process Condition ◽  
Resin Content

This paper presents the manufacturing process of scrimber by using mulberry branches and urea-formaldehyde. The effect of density, hot-pressing conditions and resin content on scrimbers mechanical properties was conducted. The results showed that the mechanical properties of the scrimber met the relative requirements in the density of 0.8 g/cm3 while the resin content was 12% and the hot-pressing conditions were in 1.5MPa, 100°C and 1.4min/mm. The MOR, MOE and IB of samples had reached 40.14MPa, 5024.20MPa and 0.44MPa under the best process condition. The MOR and MOE had achieved the standard of LY/T 1655-2006 and the surface of scrimber had natural textures which could be used as decorated materials for building.

Alloying Element Nickel Influence on Microstructure and Properties of Weathering Steels

2011 ◽  
Vol 295-297 ◽  
pp. 1436-1440 ◽  
Author(s):  
Zhi Yong Liu ◽  
Xin Lai He ◽  
Ji Qing Chen ◽  
Shan Wu Yang ◽  
Bang Wen Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Corrosion Test ◽  
Nickel Content ◽  
Alloying Element ◽  
Accelerated Corrosion ◽  
Corrosion Resistant ◽  
Microstructure And Properties ◽  
Microstructure Observation ◽  
Accelerated Corrosion Test

By testing the mechanical properties, microstructure observation, accelerated corrosion test, the effect of alloying element nickel on microstructure and properties of weathering steels was studied. The results showed that nickel content from 0 to 0.44%（mass percent）have little influence on microstructure and mechanical properties of weathering steels.The corrosion resistance enhanced with increasing nickel content, and nickel content of 0.11% or more had significant enfluence on corrosion resistant performance of weathering steels.

scholarly journals Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

2020 ◽  
Vol 9 (6) ◽  
pp. 739-748
Author(s):  
Bingzhu Wang ◽  
Daxin Li ◽  
Zhihua Yang ◽  
Dechang Jia ◽  
Jingyi Guan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructural Evolution ◽  
Hot Pressing ◽  
Raw Materials ◽  
Hybrid Structure ◽  
Second Step ◽  
Composite Ceramics ◽  
Hot Pressing Sintering ◽  
Reactive Hot Pressing

AbstractThe in situ nano Ta4HfC5 reinforced SiBCN-Ta4HfC5 composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the resulting SiBCN-Ta4HfC5 were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC underwent crushing, cold sintering, and short-range interdiffusion to finally obtain the high pure nano Ta4HfC5. A hybrid structure of amorphous SiBCN and nano Ta4HfC5 was obtained by adopting a second-step ball-milling. After reactive hot-pressing sintering, amorphous SiBCN has crystallized to 3C-SiC, 6H-SiC, and turbostratic BN(C) phases and Ta4HfC5 retained the form of the nanostructure. With the in situ generations of 2.5 wt% Ta4HfC5, Ta4HfC5 is preferentially distributed within the turbostratic BN(C); however, as Ta4HfC5 content further raised to 10 wt%, it mainly distributed in the grain-boundary of BN(C) and SiC. The introduction of Ta4HfC5 nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics, reaching to 344.1 MPa and 4.52 MPa·m1/2, respectively. This work has solved the problems of uneven distribution of ultra-high temperature phases in the ceramic matrix, which is beneficial to the real applications of SiBCN ceramics.

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