研究直接轧制变形工艺对 Ti-B20-0.1B 合金组织和性能的影响。结果表明：加入少量硼可显著细化钛合金晶粒尺寸，提高合金的成形能力；Ti-B20-0.1B合金可不经过开坯锻造过程进行直接轧制，直接轧制使铸态组织中分布在晶界的TiB主要沿着轧制方向定向排列，定向排列的TiB晶须通过应力承载机制提高合金的拉伸强度。随着直接轧制变形量的增加，Ti-B20-0.1B合金中初生α相发生显著再结晶；经过两相区固溶及550℃时效处理后，直接轧制合金的力学性能显著提高。当压下率达到80%时，时效态Ti-B20-0.1B合金的抗拉强度达到1497.5 MPa，而伸长率为6.4%。
The effect of direct rolling process on microstructure and properties of Ti-B20-0.1B alloy was studied. The result shows that the addition of trace boron significantly refines the grain size of titanium alloy and improves the formability of titanium alloy. Direct rolling can be conducted on Ti-B20-0.1B alloy without the cogging process. Direct rolling makes TiB at the grain boundary in the as-cast microstructure align along the rolling direction. The tensile strength is improved by the aligned TiB whiskers through the load-sharing mechanism. The recrystallzation of primaryα in Ti-B20-0.1B alloy occurs with the increase of deformation amount. After being solution-treated in two phases zone and aged at 550℃, the mechanical properties of the direct rolling alloy are significantly improved. When the reduction ratio is 80%, the tensile strength of the aged Ti-B20-0.1B alloy is 1497.5 MPa, and the elongation is 6.4%.
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