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Tailoring intermetallic precipitation to achieve ultrahigh strength and low thermal expansion in Super Invar alloys
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DOI：10.1016/j.msea.2026.150882.png)
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Abstract
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• Al/Ti ratio control enabled selective γ′ or η precipitation in Super Invar alloys. • AT-A formed fine γ′ precipitates, improving strength and strain compatibility. • T-A formed coarse needle-like η precipitates, causing stress localization and early fracture. • AT-A achieved 1158 MPa tensile strength with a CTE as low as 2.66 ppm K−1.
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