Functionally graded materials (FGMs) are a broad research area and attract considerable tremendous attention today in the materials science and engineering society. In recent years, FGMs have experienced remarkable developments in manufacturing methods. FGMs can be produced using several well-known processing techniques from conventional to advanced. This research provides an overview of manufacturing methods for FGMs, thus describing the fundamental difficulties and strengths of these methods based on the available literature over 30 years. Besides, this critical review gives a comprehensive summary of the various applications and the future trends for research required for the design and production of these materials properly with a smooth graded. The anticipated findings of the current paper can be considered as a milestone for future production and analysis investigations for FGMs and are beneficial for researchers, designers, and manufacturers in this scope.

功能梯度材料（FGM）是一个广泛的研究领域，当今在材料科学和工程学会中引起了极大的关注。近年来，女性生殖器切割在制造方法方面取得了令人瞩目的发展。可以使用从传统到先进的几种众所周知的加工技术来生产FGM。这项研究概述了FGM的制造方法，从而根据30多年来的可用文献描述了这些方法的基本困难和优势。此外，这篇重要的评论对各种应用以及未来的发展趋势进行了全面的总结，以合理地进行平滑的分级设计和生产这些材料所需的研究。