中文摘要：

利用光学显微镜（OM）、扫描电子显微镜（SEM）、X射线衍射仪（XRD）和拉伸力学试验等方法对铸锭冶金Ti-45Al-7Nb-0.3W合金热轧板材力学性能的各向异性进行研究。结果表明：Ti-45Al-7Nb-0.3W合金热轧板材具有明显的力学性能各向异性,在室温条件下,沿轧制方向的屈服强度σ_（RD）为445 MPa,高于沿横向的屈服强度σ_（TD）;在800℃条件下,σ_（RD）为522 MPa,低于σ_（TD）。织构和显微组织表明：经热轧变形后,板材中存在明显{100}〈010〉立方织构,即面心四方γ晶胞的c轴平行于横向;在轧制纵截面上,板材显微组织表现为拉长的γ晶粒和α_2/γ层片晶团;在横截面上,板材显微组织表现为等轴的γ晶粒和α_2/γ层片晶团。Ti-45Al-7Nb-0.3W合金热轧板材力学性能的各向异性是由织构和显微组织的差异所致。

英文摘要：

The anisotropy of mechanical properties of ingot metallurgical Ti-45Al-7Nb-0.3W alloy hot-rolling sheet was investigated by optical microscopy（OM）, scanning electron microscopy（SEM）, X-ray diffractometry and tensile test. The results indicate that the hot-rolling sheet presents significant anisotropy of mechanical properties, at room temperature, the yield strength of rolling direction（RD） is 445 MPa, which is higher than that of the transverse direction（TD）; while at 800℃, the yield strength of rolling direction（RD） is 522 MPa, which is lower than that of the transverse direction（TD）. The texture and microstructure analysis results indicate that there exists a strong cube texture {100}（010） in the rolling sheet, i.e., the （001） c-axes of the tetragonal y-TiA1 unit cells parallel to the TD. And along the rolling direction the microstructure of TiA1 alloy hot-rolling sheet are composed of elongated y grains and aα2/y lamellar colonies, while along the transverse direction the microstructure is composed of elongated y grains and α2/y lamellar colonies. The existing texture and difference of microstructure result in the mechanical anisotropy of Ti-45Al-7Nb-0.3W alloy hot-rolling sheet.