Fabrication of Ti66V13Cu8Ni6.8Al6.2 Bulk Composites with High Strength by Spark Plasma Sintering and Crystallization of Amorphous Phase
Fabrication of Ti66V13Cu8Ni6.8Al6.2 Bulk Composites with High Strength by Spark Plasma Sintering and Crystallization of Amorphous Phase
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DOI：
10.4028/www.scientific.net/amr.284-286.25
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
X. Wu;W. Chen;Chao Yang;S. Qu;Y. Li
中科院分区：
文献类型：
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作者：
X. Wu;W. Chen;Chao Yang;S. Qu;Y. Li
以机械合金化合成的非晶态Ti66V13Cu8Ni6.8Al6.2粉末为原料，采用放电等离子烧结法制备了高强Ti66V13Cu8Ni6.8Al6.2块体复合材料。采用X射线衍射仪(XRD)、差示扫描量热仪(DSC)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对合成的非晶态粉末及其复合材料进行了表征。结果表明，与非晶态Ti66Nb13Cu8Ni6.8Al6.2相比，合成的非晶态粉末的过冷液相区ΔTx和晶化热焓DHx降低，表明钒元素替代Nb元素降低了非晶态粉末的热稳定性和玻璃形成能力。合成的非晶态粉末的颗粒尺寸也变小。此外，与Ti66Nb13Cu8Ni6.8Al6.2大块合金类似，所制备的合金还由体心立方β-Ti(V)和面心立方(Cu，Ni)-Ti2区域组成。合金的断裂强度在1966 Mpa左右较高，但塑性有限。
Ti66V13Cu8Ni6.8Al6.2 bulk composites with high strength were fabricated by spark plasma sintering of amorphous Ti66V13Cu8Ni6.8Al6.2 powder synthesized by mechanical alloying. X-ray diffraction (XRD), differential scanning calorimeter (DSC), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to investigate the synthesized amorphous powder and the fabricated composites. Results show that the supercooled liquid region ΔTx and the crystallization enthalpy DHx of the synthesized amorphous powder decrease, in relative with amorphous Ti66Nb13Cu8Ni6.8Al6.2 powder, indicating that the thermal stability and glass forming ability of the synthesized amorphous powders decreases with vanadium element substituted for niobium element. And particle size of the synthesized amorphous powder also decreases. In addition, the fabricated alloys also consist of body-centered cubic β-Ti (V) and face-centered cubic (Cu, Ni)-Ti2 regions, similar to Ti66Nb13Cu8Ni6.8Al6.2 bulk alloys. The alloys exhibit a high fracture strength around 1966 MPa but limited plasticity.