粉末冶金难变形材料热静液挤压技术进展

综述了热静液挤压技术在烧结态粉末冶金难变形材料挤压成形与粉末体高致密化固结方面的研究进展。简述了热静液挤压工艺原理、工艺特点与适用范围,分析了热静液挤压润滑层形成的影响因素,介绍了热静液挤压润滑介质研制和热静液挤压技术在粉末冶金高比重钨合金、γ-TiAl基合金材料的挤压成形以及纳米晶铝合金、弥散强化铜合金、NdFeB永磁合金等金属粉末体材料的高致密化固结成形方面的应用,指出了热静液挤压工艺的技术优势与发展前景。

Progress in Hot Hydrostatic Extrusion of Powder Metallurgy Hard Metallic Materials

Recent research progress in hot hydrostatic extrusion of both sintered powder metallurgy hard metallic materials and powder compacts is reviewed. Both the fundamentals and the technical features and application potentials of the technique are introduced, and the factors affecting the formation and stability of the lubricant layer during extrusion are an- alyzed. In particular, examples for the development of the lubricant for hot hydrostatic extrusion are presented and the applications of the hot hydrostatic extrusion process to the forming of sintered P/M heavy tungsten alloy, γ-TiAl based alloy products and the full densification and consolidation of nanocrystalline powders of aluminum alloys, dispersion strengthened copper alloys, and NdFeB magnetic alloys are addressed. Based on this, summary remarks arc presented on the advantageous aspects and the prospects of the technique.