Chuanbin WANG
,
Qiang SHEN
,
Lianmeng ZHANG
材料科学技术（英文）
In this study, Cu was added as the third additive to lower the sintering temperature of W-Ni-Fe alloy. By adding 2 wt pct Cu, a dense 93W-3.5Ni-1.5Fe-2.0Cu tungsten alloy was obtained by hot-pressing at a low temperature of 1573 K which is a process of liquid-phase sintering. As a result, the morphology of W-Ni-Fe alloy changed obviously after the addition of Cu and the alloy had higher relative density and rupture strength. The mechanism of the densification of W-Ni-Fe-Cu alloy at the low temperature was then mainly investigated. It was found that, part sintering activators Ni and Fe could exist in liquid form at 1573 K due to the addition of Cu, which made it easy for Ni and Fe to dissolve W and thus the full densification of W-Ni-Fe-Cu alloy at the low temperature was realized.
关键词:
W-Ni-Fe alloy
,
null
,
null
齐艳飞
,
李运刚
,
田薇
材料导报
介绍了W-Ni-Fe合金中Cr、Co、Mn和RE(La,Y,La-Y)元素对其性能的影响,并扼要分析了合金元素对其性能的影响机制.其中,Cr与W、Ni、Fe、O等元素在合金中形成富Cr固溶体,进而会形成偏聚,降低W合金的结合强度及力学性能;Co元素可增强基体相对W颗粒的润湿性及界面间的结合强度,合金的塑性变形、强度及延伸率都有所提高;Mn元素在相界面上生成的中间相可阻止W原子在粘结相扩散,抑制W晶粒的长大,提高合金的力学性能.添加La-Y与单独添加La或Y的作用相同,当添加等量的稀土元素时,添加物对合金性能影响程度的顺序是Y＞La-Y＞La.
关键词:
W-Ni-Fe合金
,
合金元素
,
力学性能
,
组织
马运柱
,
张佳佳
,
刘文胜
,
赵亚旭
稀有金属材料与工程
研究了W-Ni-Fe合金在2.45 GHz微波炉中瞬时液相烧结的致密化行为和力学性能.结果表明:微波辅助热场下的93W-Ni-Fe合金显示出优异的力学性能和快速的致密化过程,其压缩试样在1500℃下烧结5 min后,拉伸强度、延伸率、相对密度和硬度(HRC)分别是1200MPa,16.6％,98.6％和42.0;在微波辅助热场下,试样烧结可以减少80％的烧结时间;微波辅助热场下的瞬时液相烧结有利于减少烧结时间,加快致密化过程,并且有利于钨晶粒的细化,获得组织均匀和综合性能高的W-Ni-Fe合金.
关键词:
W-Ni-Fe合金
,
微波加热
,
瞬时液相烧结
,
力学性能
李志
,
席聚奎
,
杨蕴林
金属学报
用Auger谱仪、电子探针分析和透射电镜、扫描电镜观察等手段,考察了高温复压处理对93钨合金磷偏析的影响。发现在1200—1500℃保温后炉冷,在钨-钨晶界特别是钨-粘结相相界上存在磷偏析,而在该温度范围复压后炉冷,则未发现磷在晶界和相界上偏析;复压处理态材料粘结相中位错直接影响磷向界面偏析,为退火处理的材料因磷在界面偏析而引起机械性能下降。
关键词:
钨合金
,
high temperature repressing
,
interface
,
P segregation
,
dislocation
