杨宗辉
,
沈以赴
,
初雅杰
,
徐振钦
稀有金属
采用铜箔/90W-5Ni-5Co(质量分数,％)混合粉末/镍箔复合中间层,在加压5 MPa、连接温度1120℃、保温60 min的工艺条件下,对纯钨(W)和0Crl3Al钢进行了连接.利用SEM、EDS、电子万能试验机及水淬热震实验等手段研究了接头的微观组织、成分分布、断口特征、力学性能及抗热震性能.结果表明,连接接头由钨母材、Cu-Ni-Co合金层、钨基高密度合金层、镍层、钢母材5部分组成.接头中的钨基高密度合金层由90W-5Ni-5Co混合粉末固相烧结生成,其Ni-Co粘结相和钨颗粒相冶金结合且分布均匀.钨基高密度合金层与钨母材以瞬间液相扩散连接机制实现了良好结合.接头剪切强度达到286MPa,断裂均发生在钨基高密度合金层/镍层结合区域,断口形貌呈现为韧性断裂.经过60次700℃至室温的水淬热震测试,接头无裂纹出现.
关键词:
钨
,
钨基高密度合金
,
连接
,
热震
X.H.Qu
,
J.L. Fan
,
Y.M. Li and B. Y Huang(The State Key Laboratory for Powder Metallurgy
,
Central South University of Technology
,
Changsha410083
,
China)
金属学报(英文版)
The mixture of 90%W 7wt%Ni and 3wt%Fe elemental powders was milled in a planetary high-enerpy ball mill. The evolution of the structure during milling and the sintering behavior Of the milled powders were tested. The results showed that by mechanical alloying W(Ni, Fe) supersatumted solid solution with nano-meter size formed, which can enhance the sintering process. Ftilly dense alloy from the milled powders was obtained through solid state sintering. The tensile strength of the obtained alloy is over 900MPa which is comparuble to that of the alloy sintered by traditional liquid-phase sintering from un-milled powders of the same composition.
关键词:
mechanical alloying
,
null
,
null
,
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