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Spark plasma sintering (SPS) is an important method of preparation of Ni-Al alloy high performance aircraft material. This paper adopted grey cluster analysis to estimate the Ni-AI alloy aircraft material with different chemical compositions. The cluster properties were judged according to the summary of three grey degrees. The evaluating results can be used for guiding experiment technology and future application in actual production. [ABSTRACT FROM AUTHOR]

This paper firstly adopted grey cluster analysis to estimate quenching technology of automobile axle tube. The cluster properties are judged according to the summary, of three grey degrees. The evaluating results are compared with the actual measurement, which square with the actual properties. [ABSTRACT FROM AUTHOR]

This paper has, for the first time, adopted grey cluster analysis to estimate eight kinds of states of welds in service, including strength, plasticity and toughness such as yield strength, tensile strength, elongation, percentage of section reduction and impact ductility. The cluster league is judged according to the summary of three grey leagues, and the cluster results are fully fitted with the actual status. [ABSTRACT FROM AUTHOR]