Cryogenic treatment induces microstructure evolution and coordinately regulates mechanical properties of CuCrZr alloys through multiple strengthening mechanisms
Source abstract
Abstract
In this study, the crucial task of enhancing the mechanical properties of CuCrZr alloys to extend mold lifetime was addressed. The intricate interplay between microstructure and mechanical properties controlled by cryogenic treatment was explored through comprehensive analysis, and the benefits of various strengthening mechanisms in enhancing alloy strength were quantified. Specifically, the alloys experienced stress-induced lattice contraction at ultra-low temperatures, leading to effective grain refinement and random grain orientation, as confirmed by quasi-in situ EBSD observations. This process was accompanied by a substantial increase in subgrains, which predominantly manifested as low-angle grain boundaries, along with the accumulation of high-density dislocations. Furthermore, two distinct submicron-level precipitates emerged after cryogenic treatment: pure Cr particles within the grain and Cu 5Zr particles at the grain boundary, each exhibiting incoherent and non-coherent interfaces, with the matrix, respectively. Additionally, the presence of nanoscale pure Cr precipitates dispersed throughout the matrix significantly contributed to the enhancement of strength. Cryogenic treatment demonstrated superior advantages in increasing alloy yield strength compared to conventional heat treatment methods, highlighting its high potential as a strategic approach.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced materials and composites · Metal Alloys Wear and Properties · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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