期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 22, 期 8, 页码 851-859出版社
SPRINGER
DOI: 10.1007/s12613-015-1142-7
关键词
copper-nickel alloys; columnar grains; compressive deformation; dynamic recrystallization; grain boundaries
类别
资金
- National Key Technology Research and Development Program of China [2011BAE23B00]
- National Natural Science Foundation of China [51104015]
- Independent Research Program of State Key Laboratory for Advanced Metals and Materials [2012Z-12]
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals [SKL-SPM-201204]
The dynamic recrystallization (DRX) behavior of continuous columnar-grained (CCG) CuNi10Fe1Mn alloy was investigated by hot compression along the solidification direction (SD) and perpendicular to the solidification direction (PD). Specimens were compressed to a true strain of 0.8 at temperatures ranging from 25A degrees C to 900A degrees C and strain rates ranging from 0.01 to 10 s(-1). The results indicate that DRX nucleation at grain boundaries (GBs) and DRX nucleation at slip bands (SBs) are the two main nucleation modes. For SD specimens, C-shaped bending and zig-zagging of the GBs occurred during hot compression, which made DRX nucleation at the GBs easier than that at the SBs. When lnZ a parts per thousand currency sign 37.4 (Z is the Zener-Hollomon parameter), DRX can occur in SD specimens with a critical temperature for the DRX onset of similar to 650A degrees C and a thermal activated energy (Q) of 313.5 kJ center dot mol(-1). In contrast, in PD specimens, the GBs remained straight, and DRX nucleation occurred preferentially at the SBs. For PD specimens, the critical temperature is about 700A degrees C, Q is 351.7 kJ center dot mol(-1), and the occurrence condition of DRX is lnZ a parts per thousand currency sign 40.1. The zig-zagging of GB morphology can significantly reduce the nucleation energy at the GBs; as a result, DRX nucleation occurs more easily in SD specimens than in PD specimens.
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