中文摘要：

研究以廉价Fe-Cr中间合金替代工业钛合金中较贵的金属V元素,设计新型Ti-6A1-x Fe-y Cr低成本合金。采用非自耗真空电弧炉熔炼合金锭,利用扫描电镜、电子万能试验机对合金的显微组织进行观察、拉伸、压缩性能进行分析,利用维氏硬度计测试合金的显微硬度。结果表明：Ti-Al-Fe-Cr合金的显微组织主要为等轴状的β相,在晶界处有块状和粒状α相析出。随Fe和Cr元素含量的增加,组织中β相比例增加。该合金的抗拉强度在700 MPa以上,随着合金中Fe元素和Cr元素含量的增加,该合金的抗拉强度进一步增大,显微硬度也得到进一步提升。其中,Fe元素含量增加对合金的强化效果比Cr元素含量增加的强化效果更为明显。当Fe含量为2%、Cr含量为12%时,该合金获得最佳力学性能,抗拉强度973 MPa、伸长率3.9%、显微硬度338 HV。

英文摘要：

A new type of Ti-6A1-x Fe-y Cr low cost alloy was designed by replacing the more expensive metal V elements in the industrial titanium alloy with the cheap Fe-Cr master alloy. The alloy ingots were smelted by non-consumable vacuum arc melting furnace. The microstructures of the alloy were investigated using scanning electron microscopy（SEM）. The tensile and compressive properties of the alloys were analyzed by electronic universal testing machine, and the microhardness of the alloy was measured by Vickers hardness tester. The results show that the microstructure of Ti-Al-Fe-Cr alloy is mainly equiaxed β phase, and then the massive and globular α phases are precipitated at grain boundaries. With the increase of the content of the Fe and Cr, the proportion of β phases in microstructure increases. The tensile strength of the alloys is above 700 MPa. With the increase of the content of Fe and Cr in the alloys, the tensile strength and the microhardness of the alloys are furtherly increased. Among them, the strengthening effect of Fe element is more obvious than that of Cr element. When the contents of Fe and Cr is 2% and 12%, the best performance of the alloy is gained, and its tensile strength, elongation and microhardness reaches 973 MPa, 3.9% and 338 HV, respectively.