摘要
四种元素粉末的混合物在室温下球磨、当球磨时间达到107min时，原位热分析监测到一个放热化学反应的发生分析表明大量的NiAl和TiC化合物反应生成其反应合成机理属于燃烧合成反应机制包含着两个独立的化学反应，即Ni＋Al→NiAl，Ti＋C→TiC．燃烧反应后，还存在少量的元素粉末．进一步球磨导致NiAl和TiC的逐渐生成．终产物中TiC的晶粒尺寸约为NiAl晶粒尺寸的2.5倍，与传统观点相反，归结于一种新的变形机制．
Ni, Al, Ti, and C powders mixed at a composition of Ni37Al37Ti37C13 were milled in a high-energy ball mill.Upon milling for 107 min,an abrupt reaction occurred, resulting in in situ formation of NiAl and TiC compounds.The formation mechanism is suggested to be two separated combustion reactions, i.e. Ni+Al→NiAl and Ti+C→TiC. The combustion reaction conducted incompletely and small amount of elemental powders still existed. Prolonged milling led to gradual formation of NiAl and TiC as well as the refinement of grain sizes. The final saturated grain size for TiC is 2.5 times as large as that for NiAl, though TiC has a much higher melting point compared with NiAl, this is attributed to a different deformation mechanism.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第11期1222-1226,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金
国家高技术专家委员会资助!863-715-005-0030
关键词
机械合金化
纳米材料
复合材料
碳黑
formation mechanism,mechanical alloying,nanocomposite,intermetallics
