Microstructural Investigations and Residual Stress Analysis of ZrO2 /Ni Functionally Graded Materials

2005 ◽  
pp. 157-162
Author(s):  
D. Dantz ◽  
Ch. Genzel ◽  
W. Reimers
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Graded Materials ◽  
Residual Stress Analysis

Optimization of the sintering temperature, cooling time and grain size parameters to reduce residual stresses of copper-aluminum functionally graded material using response surface methodology

2021 ◽  
pp. 030932472110687
Author(s):  
Ahmad Gheysarian ◽  
Mohammad Honarpisheh
Keyword(s):  
Residual Stress ◽  
Grain Size ◽  
Residual Stresses ◽  
Functionally Graded Materials ◽  
Sintering Temperature ◽  
Flexible Structures ◽  
Functionally Graded ◽  
Cooling Time ◽  
Property A ◽  
Graded Materials

One of the urgent needs for the medical, aerospace and military industries is to combine materials with heat-resistant as well as flexible structures. To create such a property, a ceramic must be placed next to metal. FGM materials have such a property in terms of thickness. Functionally graded materials (FGM) are examples of materials with different properties in the thickness direction. In the functionally graded materials, different properties can be created, by changing the percent weight of materials in each layer. It is very important to study the number of residual stresses in these materials due to the fact that several materials with different properties are combined with each other. The purpose of this study is to investigate the effect of production parameters on the number of residual stresses in the aluminum-copper FGM part and also to optimize the production process of these materials. The results indicate that the number of residual stresses decreases with increasing the sintering temperature, cooling time of the sample as well as uniformity along the thickness. In the experiments, the maximum residual stress was 171 MPa, which was obtained for a grain size of 100 microns, sintering temperature of 600°C and cooling time of 24 h and the minimum value of pressure residual stress was 120 MPa, which was obtained for grain size of 20 microns, sintering temperature of 900°C and cooling time of 48 h. Also, finite element modeling of the process was performed and shown a good agreement with experimental results.

Phase instability in ZrO2–NiAl functionally graded materials

1997 ◽  
Vol 12 (10) ◽  
pp. 2589-2593 ◽  
Author(s):  
Yi-Rong He ◽  
Vidya Subramanian ◽  
John J. Lannutti
Keyword(s):  
Residual Stress ◽  
Functionally Graded Materials ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Functionally Graded ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Graded Materials ◽  
Temperature Transformation ◽  
Phase Retention

Sedimentation in organic solvents was followed by hot-pressing to produce 2 mole % yttria stabilized zirconia-NiAl functionally graded materials (FGM's). These FGM's were better able to accommodate high levels of residual stress than alumina-NiAl FGM's; this is possibly due to enhanced tetragonal phase retention. However, we found that the zirconia layer in these FGM's subsequently experiences room temperature transformation of t-ZrO2 to m-ZrO2.

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