论文部分内容阅读
采用单辊熔体快淬法制备了厚约40μm,宽2mm的二元TixCu100-x(x=50,57)合金条带。用X射线衍射检测了合金的非晶形成能力,通过差示扫描量热仪(DSC)分析了Ti50Cu50和Ti57Cu43两种非晶合金的热稳定性,利用扫描电镜观察了合金的铸锭组织形貌。结果表明,两种非晶合金均未表现出明显的玻璃转变温度点Tg,晶化温度Tx差别不大,熔化开始温度Tm相差高达35K。通过研究两合金的铸锭母合金显微组织,发现Ti57Cu43合金在非平衡凝固过程中有Ti2Cu相析出,造成形成非晶合金所需的临界冷却速率提高。与Ti50Cu50合金相比,Ti57Cu43合金降低了Ti-Cu二元合金的非晶形成能力。讨论了铸锭显微组织竞争相与热稳定性之间的关系。
A binary TixCu100-x (x = 50,57) alloy strip with a thickness of about 40μm and a width of 2mm was prepared by single-roll melt quenching. The amorphous formability of the alloy was measured by X-ray diffraction. The thermal stability of Ti50Cu50 and Ti57Cu43 amorphous alloys were analyzed by differential scanning calorimetry (DSC). The morphology of ingot of the alloy was observed by scanning electron microscopy . The results show that the two amorphous alloys show no obvious glass transition temperature (Tg), the difference of crystallization temperature (Tx) is not big, and the melting start temperature (Tm) is as high as 35K. Through the study of the microstructure of the two alloy ingot mother alloys, Ti2Cu phase is found to precipitate during the non-equilibrium solidification of the Ti57Cu43 alloy, resulting in an increase of the critical cooling rate required for the formation of the amorphous alloy. Compared with Ti50Cu50 alloy, Ti57Cu43 alloy reduces the amorphous formation ability of Ti-Cu binary alloy. The relationship between the competitive phase and thermal stability of ingot microstructure was discussed.