Fe-Cu粉末机械合金化的过程与固态烧结后组织性能关系研究.pdf

第26卷第5期
粉末治金技术
Vol 26, No
2008年10月
Powder Metallurgy Technology
Oct.2008
发
究与一一FeCu粉末机械合金化的过程与
固态烧结后组织性能关系研究
孙金峰””李晓普王明智“““赵玉成
(燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004)
摘要:分析了机械合金化过程中粉体能量储存对固态烧结过程的影响。以具有正的混合热的FeCu粉体
为研究对象,分析了Fe-Cu粉体在机械合金化中存在的储能现象及其与机械合金化过程时间的关系,提出了
存在最髙储能的机械合金化时间,这一储能对固态烧结具有积极意义。研究认为:机械合金化进程中,粉体粒
度、晶粒度、应变、缺陷等不平衡因素导致能量提高,固态烧结加热过程中能量的释放促进了颗粒表面物质交
换,从而提高了粉体固态可烧结性,改善了烧结组织
关键词:机械合金化;固态烧结;储能;组织
Mechanical alloying of Fe-cu powder and microstructure
of solid phase sintered bod
Sun Jinfeng, Li Xiaopu, Wang Mfingzhi, Zhao Yucheng
( Key Laboratory of Metastable Materials Sence &Tech, Yanshan Univesity, huangda Hbi 66004, hina)
Abstract: The effect of stored energy produced by mechanical alloying on the solid state sintering was analyzed in
this paper. The Fe-cu powders having a lot of positive mixing heat were studied. The energy storing in Fe-cu
powders under mechanical alloying and the relationship between stored energy and mechanical alloying time were
analyzed. A best mechanical alloying time is presented under which the stored energy could get the maximum. The
stored energy in the powders has a positive effect on solid state sintering. The energy in the powders is increased by
the unbalance factors such as the particle size, grain size, strain and defects. The stored energy is released in the
heating process of solid state sintering which accelerates the mass exchange between the particle surfaces. So the
solid state sintering character and the structure of the sintered body are improved
Key words: mechanical alloying; solid state sintering; storage energy; structure
机械合金化(MA)在近几十年的研究中日趋深高度混合,降低了合金化所要求克服的制约原子移
入,在新材料制备、常规条件难以合金化元素之间的动的扩散激活能,使合金化更容易发生。MA的过
合金化等方面得到迅速发展;特别是近几年方兴未程中发生的能量积累现象是十分重要的,这一能量
艾的纳米材料、磁性材料、非晶材料等特殊材料制备积累是随着MA时间的延续而增加,在某一阶段达
领域,更是对MA方法做到了充分的研究和利到高峰,在实现合金化过程中逐步释放。粉末治金
用“?。MA的过程中都伴随高速、大変形的行工艺中相当多的情况是固态烧结,特别是在金属结
为,造成高密度的各类缺陷、原子偏离结点,使颗粒、合剂超硬材料制品的制造过程中尤为重要,该类制
晶粒细化。在这种情况下,体系中不同种类的原子品中的主要组分一一金刚石、CBN等的耐热、抗氧
河北省自然科学基金资助项目(E2004000218);河北省科技攻关项目资助(05212201D)
孙金峰(1982-),男,博十
米通讯作者:王明智,教授,博导。E-mail:wmzw@yu.edu.cn
收稿日期:2007-01-22