The Role of Porosity in Reducing the Thermal Conductivity of B319 Al Alloy with Decreasing Solidification Rate

JOM ◽  
2019 ◽  
Vol 71 (6) ◽  
pp. 2072-2077 ◽  
Author(s):  
Eli Vandersluis ◽  
Comondore Ravindran
Keyword(s):  
Thermal Conductivity ◽  
Solidification Rate ◽  
Al Alloy

Interfacial Wettability and Thermal Conductivity of Diamond/Al Based Composites with Ti and B Additions

2015 ◽  
Vol 816 ◽  
pp. 169-176
Author(s):  
Shu Xian Li ◽  
Hong Guo ◽  
Ye Ming Fan ◽  
Yuan Yuan Han ◽  
Xi Min Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Bending Strength ◽  
Interfacial Bonding ◽  
Al Alloy ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Diamond Surfaces ◽  
Interfacial Bonding Strength ◽  
B Additions

Al-based and Al-alloy-based diamond composites were made by pressure infiltration process in order to obtain composites with high thermal conductivity and light weight for thermal management applications. Interfacial bonding strength and thermal physical properties of the Al-alloy-based composites were improved with additions elements of Ti and B. Influence of Ti and B on interfaces at 950 °C between diamond and Al matrix were found to play an effective bridge role of wettability, a large improvement of selectivity was observed between {100} and {111} diamond surfaces. SEM and EDS analysis suggested that the segregation of B element was confirmed to have primary effect on the interfacial bonding. The as-fabricated diamond/Al (Ti, B) composite exhibited thermal conductivity value as high as 449 W/m·K, thermal expansion coefficient as low as 6.2 × 10-6 K-1, and the bending strength as high as 312 MPa.

Lattice Thermal Conductivity Modelling of a Diatomic Nanoscale Material

2020 ◽  
Vol 10 (5) ◽  
pp. 602-609
Author(s):  
Adil H. Awad
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Correction Term ◽  
Nanoscale Material ◽  
New Approach ◽  
Two Samples ◽  
Conductivity Modelling ◽  
Callaway Model

Introduction: A new approach for expressing the lattice thermal conductivity of diatomic nanoscale materials is developed. Methods: The lattice thermal conductivity of two samples of GaAs nanobeam at 4-100K is calculated on the basis of monatomic dispersion relation. Phonons are scattered by nanobeam boundaries, point defects and other phonons via normal and Umklapp processes. Methods: A comparative study of the results of the present analysis and those obtained using Callaway formula is performed. We clearly demonstrate the importance of the utilised scattering mechanisms in lattice thermal conductivity by addressing the separate role of the phonon scattering relaxation rate. The formulas derived from the correction term are also presented, and their difference from Callaway model is evident. Furthermore their percentage contribution is sufficiently small to be neglected in calculating lattice thermal conductivity. Conclusion: Our model is successfully used to correlate the predicted lattice thermal conductivity with that of the experimental observation.

Role of electron–phonon coupling in thermal conductivity of metallic nanofluids

2019 ◽  
Vol 52 (48) ◽  
pp. 485302 ◽  
Author(s):  
Dong-Xing Song ◽  
Yu-Feng Zhang ◽  
Wei-Gang Ma ◽  
Xing Zhang
Keyword(s):  
Thermal Conductivity ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Thermal Conductivity of Unidirectionally Aligned SiC Whisker Reinforced Al Alloy Matrix Composite with Interfacial Thermal Resistance

2005 ◽  
Vol 46 (2) ◽  
pp. 148-151 ◽  
Author(s):  
Yibin Xu ◽  
Yoshihisa Tanaka ◽  
Masaharu Murata ◽  
Kazushige Kamihira ◽  
Yukihiro Isoda ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Resistance ◽  
Matrix Composite ◽  
Interfacial Thermal Resistance ◽  
Al Alloy ◽  
Alloy Matrix

Role of graphene waviness on the thermal conductivity of graphene composites

2012 ◽  
Vol 111 (1) ◽  
pp. 221-225 ◽  
Author(s):  
Ke Chu ◽  
Wen-sheng Li ◽  
Hongfeng Dong
Keyword(s):  
Thermal Conductivity

Role of Stress in the Stress Corrosion Cracking of a Mg-Al Alloy

CORROSION ◽  
1973 ◽  
Vol 29 (6) ◽  
pp. 251-260 ◽  
Author(s):  
W. R. WEARMOUTH ◽  
G. P DEAN ◽  
R. N. PARKINS
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Al Alloy
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