高能球磨Ti/ Al 复合粉固相反应烧结工艺

华南理工大学学报（自然科学版） ›› 2007, Vol. 35 ›› Issue (12): 71-75.

高能球磨Ti/ Al 复合粉固相反应烧结工艺

李小强¹屈盛官¹张忠荣²邵明¹李元元¹

1.华南理工大学机械工程学院，广东广州 510640; 2. 中国航天科技集团公司061 基地，贵州凯山 563108

收稿日期:2006-10-16 出版日期:2007-12-25 发布日期:2007-12-25
通信作者: 李小强(1972-) ，男，副教授，主要从事粉末冶金方面的研究. E-mail:Lixq@ scut. edu. cn
作者简介:李小强(1972-) ，男，副教授，主要从事粉末冶金方面的研究.
基金资助:
国家杰出青年科学基金资助项目(50325516) ;国家自然科学基金资助项目(59875015) ;广东省自然科学基金资助项目(05300305 )

Sintering Process via Solid-State Reaction of Ti/ AI Composite Powders Prepared by High -Energy Ball Milling

Li Xiao-qiang¹Qu Sheng-guan¹Zhang Zhong-rong² Shao Ming¹Li Yuan-yuan¹

1. School of Mechanical Engineering , South China Univ. of Tech. , Guangzhou 510640 , GUaJlgdong , China;2. 061 Base , Chinese Aerospace Science and Tech. Corporation , Kaishan 563108 , Guizhou , China

Received:2006-10-16 Online:2007-12-25 Published:2007-12-25
Contact: 李小强(1972-) ，男，副教授，主要从事粉末冶金方面的研究. E-mail:Lixq@ scut. edu. cn
About author:李小强(1972-) ，男，副教授，主要从事粉末冶金方面的研究.
Supported by:
国家杰出青年科学基金资助项目(50325516) ;国家自然科学基金资助项目(59875015) ;广东省自然科学基金资助项目(05300305 )

摘要/Abstract

摘要： 采用全相和能谱方法对Ti 、Al 范的固相扩散反应行为进行了研究，建立了TiAl₃相层厚度生长的计算公式.并在此基础上，探讨了球磨Ti/Al 复合粉的两步固相烧结工艺.研究表明:两步固相烧结法可有效抑制烧结引起的粉末体变形，获得具有典型显微组织的致密烧结材料;尽管延长低温预烧时间可获得由TiAl 与Ti₃A1 组成的热稳定性较好的组织，但组织致密度偏低，为了获得高致密的TiAl 合金，仍需后续高温烧结.实验还表明，高能球磨促进了TiAl 基合金组织细化，且球磨时间越长烧结组织品粒越细小;双态组织中的层片组织含量随球磨时间延长而增加，但长时间球磨由于非晶化的出现又会引起层片组织含量下降.

关键词: 钛铝, 高能球磨, 扩散反应, 固相烧结

Abstract:

The solid -state diffusion reaction behavior between Ti and Al foils was studied by using optical microscopy and energy spectrometer , and an equation describing the growth of TiA13 phase layer was deduced. Moreover , a two-step solid-state sintering process of milled Ti/ Al composite powders was investigated. The results indicate that ( 1) the proposed two-step solid-state sintering effectively avoids the deformation of powders during the sintering process and helps to obtain dense TiAl alloys with typical microstructure; (2) in order to obtain highly dense TiAl alloy , a sintering at elevated temperature after the presintering for a prolonged time at low temperature is necessaη because the presintering only helps to form thermostable microstructure of TiAl and Ti3Al and the relative density is still low; (3) the high-energy ball milling leads to fine TiAl microstructure , the longer the milling time , the finer the sintered alloy; and (4) with the increase in milling time , the content of lamella colonies in the dual-phase sinter
first increases but then decreases due to non-CIγstallization.

Key words: titanium aluminide, high-energy ball milling, diffusion reaction, solid-state sintering

李小强屈盛官张忠荣邵明李元元. 高能球磨Ti/ Al 复合粉固相反应烧结工艺[J]. 华南理工大学学报（自然科学版）, 2007, 35(12): 71-75.

Li Xiao-qiang Qu Sheng-guan Zhang Zhong-rong Shao Ming Li Yuan-yuan. Sintering Process via Solid-State Reaction of Ti/ AI Composite Powders Prepared by High -Energy Ball Milling[J]. Journal of South China University of Technology (Natural Science Edition), 2007, 35(12): 71-75.