LAUSR

ABSTRACT Functionally graded materials are special class of composites in which different materials are graded based on applications desired. Depending upon the gradation variation, whether continuous or discrete, the manufacturing processes are categorized. Powder metallurgy process is a means to fabricate discrete variation of material, which allows giving any kind of gradation like linear, hyperbolic, exponential etc. The objective of this review is to give an overview of different material combination fabricated using solid-state processes and their associated parameters like compaction load and sintering temperature in P/M process; and sintering temperature, pressure and dwelling time in case of spark plasma sintering (SPS). With SPS process, high relative density is reached in very less time. The setting of processing parameters is imperative to obtain desired properties and defect free product, which is different for different material combination. Material combination along with their applications is given which will help readers to identify material of their choice, based on their functional requirement. Mostly literatures pertains to metal-ceramic graded material combinations fabricated using P/M is available and their result shows improved mechanical properties such as hardness, flexural strength, electrical conductivity, toughness and tribological benefits compared to materials in pure form.