Phase transformation and thermal stability of mechanically alloyed W-Ni-Fe composite materials
Phase transformation and thermal stability of mechanically alloyed W-Ni-Fe composite materials
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DOI：
10.1016/j.msea.2004.02.039
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发表时间：
2004-08
期刊：
影响因子：
6.4
通讯作者：
Zhonghui Zhang;Jing-en Zhou;S. Xi;G. Ran;Pengliang Li
中科院分区：
文献类型：
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作者：
Zhonghui Zhang;Jing-en Zhou;S. Xi;G. Ran;Pengliang Li
以W、Ni、Fe元素粉末为原料，采用机械合金化（MA）工艺制备了93 W-4.9Ni-2.1Fe高比重钨合金。在MA过程中，获得了晶粒尺寸为11nm的纳米晶过饱和固溶体和非晶相。采用差示扫描量热仪（DSC）、X射线衍射仪（XRD）和能谱仪（EDX）对机械合金化93 W-4.9Ni-2.1Fe合金的相变和热稳定性进行了研究。结果表明，球磨60 h的93 W-4.9Ni-2.1Fe合金的熔点比未球磨的粉末混合物降低了约220°C。采用机械合金化的粉末在1150°C烧结30 min后，可获得均匀的显微组织和约2μm的超细钨颗粒，密度可达95%以上。在1280°C烧结30 min的高比重钨合金基体中，钨的固溶度高达63.72wt.%具有约0.5体积分数的大量基质。
The tungsten heavy alloys with the composition of 93W–4.9Ni–2.1Fe in weight percent from the elemental powders of W, Ni and Fe were mechanically alloyed (MA-ed). Nano-crystalline supersaturated solid solutions with grain size of 11nm, and amorphous phase were achieved during MA. By using a combination of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and energy-dispersive X-ray (EDX) analysis, phase transformation and thermal stability of mechanically alloyed 93W–4.9Ni–2.1Fe alloys were investigated. The results show that the melting point of 93W–4.9Ni–2.1Fe alloy milled for 60h decreases approximately by 220°C compared with the unmilled powderd mixture. When sintered at 1150°C for 30min, tungsten heavy alloys using mechanically alloyed powders show homogeneous microstructure and ultra-fine tungsten particles of approximately 2μm with high density above 95%. The matrix of tungsten heavy alloys, sintered at 1280°C for 30min using MA-ed powders, shows high W solubility about 63.72wt.% with a large amount of volume fraction of about 0.5 of matrix.