Abstract The microstructure design strategy is introduced to improve the mechanical property of a novel γ-Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 metal matrix composite (MMC) fabricated by hot isostatic press (HIP). With increasing the content of TiB 2 from 0 to 3 wt%, the average grain size, {001} maximum texture index and average schmid factor of HIP-processed Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 parts generally decrease from 27.4 μm, 7.9 and 0.43 to 22.7 μm, 4.1 and 0.38, in addition, the crystallographic texture transforms from the mixture of (001) and (111) orientations to a strong (101) orientation. The phases evolution mechanism in the HIP-processed Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 parts can be divided into four steps: first of all, β phase transforms to γ and α phases, then, a small amount of new phases of TiB and TiC emerge by the diffusion of Ti and C atoms, subsequently, the β and α orderly transform to B 2 and α 2 , lastly, the B 2 , α 2 , TiB 2 , TiB and TiC uniformly distribute in the γ matrix. Both the tensile strength and strain of HIP-processed Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 components increase from 471.9 MPa and 1.7% to 653.4 MPa 2.1% with the increase of TiB 2 content from 0 to 3 wt%.

中文翻译：

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通过热等静压加工的新型 γ-TiAl/TiB 2 金属基复合材料 (MMC) 的微观结构得到改善

摘要 引入微观结构设计策略以提高热等静压（HIP）制备的新型γ-Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 金属基复合材料（MMC）的力学性能。随着 TiB 2 含量从 0 wt% 增加到 3 wt%，HIP 处理的 Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 零件的平均晶粒尺寸、{001} 最大织构指数和平均施密特因子一般从 27.4 μm、7.9 和 0.43 减小到 22.7 μm、4.1 和 0.38，此外，晶体结构从（001）和（111）取向的混合转变为强（101）取向。HIP 处理的 Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 零件的相演化机制可分为四个步骤：首先，β 相转变为 γ 和 α 相，然后，Ti和C原子的扩散产生了少量的TiB和TiC新相，随后β和α依次转变为B 2 和α 2 ，最后是B 2 、α 2 、TiB 2 、TiB和TiC均匀分布在 γ 矩阵中。随着TiB 2 含量从0增加到3，HIP处理后的Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 组分的拉伸强度和应变均从471.9 MPa和1.7%增加到653.4 MPa 2.1%重量％。