Abstract
The influence of Cr addition on microstructure and mechanical properties of Zr-based alloys corresponding to Zr–C–Cr system was investigated. In the alloy without Cr, the second-phase ZrC particles show the dispersed distribution in the αZr matrix. The alloys with Cr addition contain αZr, carbide ZrC and intermetallic αZrCr2 phases. The microstructural observation indicates that ZrC particles present mainly the dispersed distribution in the αZr matrix, and αZrCr2 phases present the dispersed and network distribution. The Cr-added alloys exhibit the dispersed and network hybrid second-phases distribution, and show significant increase of hardness and strength compared with pure Zr and single ZrC dispersed alloy. The hardness and compressive strength of Zr-based alloys increase with the Cr content increasing. The microstructural formation and strengthening mechanism of Cr-added Zr-based alloys are also discussed in details.
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