研究高氧含量(0.30%,质量分数,下同)、工业水平氧含量(0.16%)和极低氧含量(0.06%)3种Ti-2Al合金在低温(77 K)、室温和高温(673 K)下的拉伸力学行为.结果表明:低温和室温下,随着氧含量的升高,材料强度提高,塑性降低.然而,高温673 K下,不同氧含量Ti-2Al合金强度和塑性基本相同,材料强度和塑性对氧含量的依赖性显著降低.氧含量较低时,温度对Ti-2Al合金塑性影响很小.微观组织观察表明,随着温度的升高,工业水平及高氧含量Ti-2Al合金拉伸断口由脆性解理转变为延性韧窝.高温环境下,固溶氧原子扩散速率提高使Cottrel气团对位错渭移的阻碍减弱,均匀变形的结果导致高氧含量Ti-2Al合金延性改善.
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