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From room temperature to elevated temperature: fracture mechanism transition in a bimodal O-phase dominated Ti-22Al-24Nb-0.5Mo alloy
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DOI：10.1016/j.intermet.2026.109395.png)
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Abstract
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• Bimodal O architecture delivers ∼37 MPa m1/2 toughness at room temperature. • Toughness rises to ∼62 MPa m1/2 at 650 °C, 1.7× the room-temperature value. • Room-temperature cracks mainly traverse O lamellae by multiple slip modes. • At 650 °C, interfacial cracking along O/B2 becomes markedly more prevalent. • Toughening changes from intrinsic-dominated to intrinsic/extrinsic synergy.
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