孟庆森
,
辛立军
,
陈少平
,
Munir Z A
复合材料学报
采用电场激活压力辅助合成技术(FAPAS)制备了(TiB2)PNi/(TiB2)PNi3Al/Ni3Al/Ni梯度材料,主要研究电场激活燃烧合成过程中电场对材料合成及层界面扩散连接的作用.分析了梯度材料各层的界面微观组织及相组成和材料的硬度分布.结果表明,采用FAPAS技术结合机械合金化工艺制备的(TiB2)PNi/(TiB2)PNi3Al/Ni3Al/Ni功能梯度材料具有快速、简便和组织均匀密实的特点.梯度材料的陶瓷复合层、Ni3Al层和Ni板的界面区产生成分的互扩散,形成了良好的冶金结合.从Ni板到陶瓷复合层的硬度呈梯度分布.
关键词:
电场激活
,
燃烧合成
,
Ni2Al
,
(TiB2)PNi
,
FGMs
Ke LI
,
Jun WANG
,
Da SHU
,
Baode SUN
,
Yaohe ZHOU
材料科学技术（英）
Cylinder-like in-situ Al/24Si FGMs were produced by using electromagnetic separating process. Si primary phase reinforced layer with volume fraction as high as 16 pct was formed at the outer region of the cylinder-like samples where the local hardness and wear resistance were enhanced remarkably. Moreover, both of strength and ductility in the inner region provided insurance of reliable strength for this as-cast gradient material. It indicated that general mechanical properties such as good wear resistance at the outer region and good ductility in the central part could be obtained with the optimized redistribution of the Si primary particles under the electromagnetic force.
关键词:
FGMs
,
null
,
null
K. Zhang
,
W.P. Shen
,
C.C. Ge
,
null
,
null
金属学报(英文版)
W / Cu functionally gradient materials (FGMs) containing 1% La2O3 and 1% TiC were prepared using graded sintering under ultra-high pressure (GSUHP). The specimens have been found to exhibit low porosity (11.57% and 11.35%, respectively). Shearing strength of the specimens between layers is good. Moreover, the specimens have still demonstrated good performance in testing thermal-shock resistance. When power density of laser is 200MWm-2, the specimens have been tested for thermal-shock resistance (1000 times); the specimens that contained 1% La2O3 were not subjected to damage, whereas those that contained 1% TiC began to crack. Finally, effect of additives on thermal-shock resistance was also preliminarily discussed.
关键词:
W/Cu
,
null
,
null
,
null
