Stabilization of Nano-Al2O3p/Cu Composite after High Temperature Annealing Treatment

2005 ◽  
Vol 475-479 ◽  
pp. 993-996 ◽  
Author(s):  
Ke Xing Song ◽  
Ping Liu ◽  
Bao Hong Tian ◽  
Qi Ming Dong ◽  
Jian Dong Xing
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Uniform Distribution ◽  
Internal Oxidation ◽  
Cold Work ◽  
Cold Deformation ◽  
Annealing Treatment ◽  
High Temperature Annealing ◽  
Al2o3 Particles ◽  
Copper Composite

Al2O3 dispersion strengthened copper composite (Al2O3p/Cu composite) was produced by internal oxidation. The hardness and electrical conductivity of the produced Al2O3p/Cu composite (0.60 wt.% Al2O3) subjected to high temperature annealing treatments after different cold work deformations have been investigated; the microstructures of the composite have also been analyzed by TEM. Results show that the microstructure of the composite is characterized by an uniform distribution of nano-Al2O3 particles in Cu-matrix; the composite can maintain more than 91% hardness retention after 1h, 1000°C annealing treatment; the recrystallization of the Cu-matrix can be largely retarded and only partially happened even annealing for 1h at 1050°C, following cold deformation of 84%.

scholarly journals High temperature annealing treatment on Co doped ZnO bulks

2009 ◽  
Vol 58 (5) ◽  
pp. 3274
Author(s):  
Peng Xian-De ◽  
Zhu Tao ◽  
Wang Fang-Wei
Keyword(s):  
High Temperature ◽  
Annealing Treatment ◽  
High Temperature Annealing ◽  
Doped Zno ◽  
Co Doped

Stabilization of Nano-Al2O3p/Cu Composite after High Temperature Annealing Treatment

2005 ◽  
pp. 993-996
Author(s):  
Ke Xing Song ◽  
Ping Liu ◽  
Bao Hong Tian ◽  
Qi Ming Dong ◽  
Jian Dong Xing
Keyword(s):  
High Temperature ◽  
Annealing Treatment ◽  
High Temperature Annealing

Electrical conductivity of the proton conductor BaZr0.9Y0.1O3−δ obtained by high temperature annealing

2007 ◽  
Vol 178 (25-26) ◽  
pp. 1437-1441 ◽  
Author(s):  
S DUVAL ◽  
P HOLTAPPELS ◽  
U VOGT ◽  
E POMJAKUSHINA ◽  
K CONDER ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Proton Conductor ◽  
High Temperature Annealing

Influence of High Temperature Annealing in Nitrogen on Upconversion Luminescence of β-NaYF4: Yb3+, Er3+ Hexagonal Sub-Microplates

2012 ◽  
Vol 496 ◽  
pp. 79-83
Author(s):  
Jun Wei Zhao ◽  
Tie Kun Jia ◽  
Xiang Gui Kong
Keyword(s):  
High Temperature ◽  
Sodium Citrate ◽  
Hexagonal Phase ◽  
Upconversion Luminescence ◽  
Annealing Treatment ◽  
Annealing Process ◽  
High Temperature Annealing ◽  
Nonradiative Relaxation ◽  
Before And After ◽  
Hydrothermal Methods

The pure β-NaYF4: Yb3+, Er3+ hexagonal sub-microplates were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. The size of them is about 600 nm × 400 nm (side length × thickness). The obtained sample was divided into two parts and one of them was annealed in nitrogen at 300 °C for 2 hours. The crystal structure of the β-NaYF4: Yb3+, Er3+ hexagonal sub-microplates before and after annealing treatment is hexagonal phase. Under the excitation of 980 nm diode laser, the upconversion luminescence intensity the sample after annealing is much stronger than that of the sample without annealing treatment. High temperature annealing process improved the crystallization of the sample, resulting in the decrease of the nonradiative relaxation and the enhancement of the upconversion luminescence.

Microstructure and Properties of the Dispersion-Strengthened Cu-ZrO2 Composite for Application of Spot-Welding Electrode

2014 ◽  
Vol 887-888 ◽  
pp. 32-38 ◽  
Author(s):  
Yu Song Xu ◽  
Cui Ping Jin ◽  
Peng Li ◽  
Yun Hua Xu
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Spot Welding ◽  
Cold Deformation ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Dispersion Strengthening ◽  
High Temperature Stability ◽  
Welding Electrode ◽  
Zr Alloy

This paper prepared Cu-ZrO2 composite by a modified internal oxidation in order to improve the high temperature strength of resistance Spot-welding electrode. The results showed that with the increasing of the cold deformation, Hardness increased while electrical conductivity decreases. Hardness reached 100HV and electrical conductivity was up to 86%IACS after cold drawn in 56%. With the increasing of annealing temperature and annealing time, Hardness of the composite decreased more slowly compared with the conventional Cu-Cr-Zr alloy and was higher than that of the Cu-Cr-Zr alloy after annealed above 700°C for 2h and at 600°C for 5h , which was attributed to the dispersion strengthening effect of the Zirconia particles. Thus, the Cu-ZrO2 composite has good high-temperature stability and can be used for the electrode

scholarly journals Structure of AlCoCrFeNi high-entropy alloy after uniaxial compression and heat treatment

2021 ◽  
Vol 64 (10) ◽  
pp. 736-746
Author(s):  
I. V. Ivanov ◽  
K. I. Emurlaev ◽  
A. A. Ruktuev ◽  
A. G. Tyurin ◽  
I. A. Bataev
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Uniaxial Compression ◽  
Thermal Studies ◽  
Cold Deformation ◽  
Dendritic Structure ◽  
High Entropy Alloy ◽  
Relaxation Processes ◽  
High Temperature Annealing ◽  
High Entropy

In this study, we discuss the structure and properties of high-entropy AlCoCrFeNi alloy after casting, cold deformation, and heat treatment. Ingots of the investigated alloys were obtained by arc melting method in argon atmosphere. In order to ensure a homogeneous chemical composition, ingots were remelted several times. Cylindrical samples of 5 mm in diameter and 8 mm in height were cut from ingots by electrospark method for mechanical tests. Subsequently, samples were subjected to uniaxial compression by 5, 11, and 23 %. During the tests, compression curves were recorded, and limit of proportionality of the analyzed alloys was calculated. High-temperature annealing and thermal studies were performed using thermogravimetric analyzer. Thermal studies were carried out in a cyclic mode (3 cycles, including heating up to 1200 °C at a rate of 20 °C/min and cooling at a rate of 20 °C/min). High-temperature annealing was carried out at a temperature of 1200 °C for 5 hours. Such annealing of cast alloys promotes material homogenization and eliminates dendritic structure. The alloy presents limited plasticity. Grain boundaries are effective barriers preventing crack propagation. The studies indicate that plastic deformation has a significant effect on development of relaxation processes during subsequent heat treatment. An increase in strain during the compression leads to a higher rate of healing processes of defects in crystal structure.

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