Summary on Creep Behavior of Discontinuous SiC-Al composites - Essay Example

The first experiment tested compressed creep on SiC with 3-5 wt. percentages of Li at a temperature of 505-866k. The results showed that Li increases the strengthening power of SiC and its wetting behavior. The second experiment tested the creep behavior of SiCw and SiCp covered with aluminum alloy at a temperature of 505-644k. The results showed that both composites were steady but SiCW was more resistant to creep compared to SiCp. The results were because of the variations in the components load bearing abilities, their strengths and the applied temperatures.

The conducted experiments revealed that the quality of creep rates depend on the applied temperatures and stress (Mohamed, Park & Lavernia 22). The article also used the shear lag method to test the creep rate of discontinuous composites by applying stress and geographic parameters. In this method, the composite has short fibers inserted in the creeping matrix; the shear transports the load from the matrix to fiber and this approach applies creep power law. This method is efficient in transferring the load from matrix to fiber and handling stress level within the fiber. . In the experiment, the composite phase acted as a regular aligns and there was periodic array of fibers.

The experiment applied the creep power law by ensuring that reinforcement phase remains elastic (Mohamed, Park & Lavernia 26). The results indicated that matrix develops higher stress, which reduces composites creep rates. It also showed that geometry arrangements affect the quality of the creep rate. Indeed, the results note that creep law favors the Ag-40wt. percentage composites only but not the composites of SiC-Al (Mohamed, Park & Lavernia 27). Considering the obtained results, the article explains the deformation models using dislocation motion.

It analyses whether similar dislocation processes can be applicable for both DS alloy creep and the SiC-Al composites creep. In addition, the article also evaluates successfully the characteristics of deformation process on DS alloys and SiC-Al composites. The article highlights the strain exponent of creep and identifies the following assumptions. Firstly, the high stress exponent and variations results from threshold stress. Additionally, the threshold stress and strength applied on the creep depends on applied stress and lastly, the activation energy for SiC-Al composites and DS alloys are similar (Mohamed, Park & Lavernia 30).

The article concludes that SiC-Al composites and DS alloys have similar creep behaviors regardless of their stress exponent and activation energies. Importantly, the article identifies that shear log assumptions on the creep behavior of SiC-al are inconsistence. Indeed, the study offers the similarities in the creep behavior among composites, the evidential calculations and dissimilarities among activation