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Ti-13Nb-13Zr 합금의 저 변형량에서 초미세 결정립 형성 및 기계적 적합성 향상
박찬희(C. H. Park),염종택(J. T. Yeom),전영수(Y. S. Chun),이종수(C. S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Microstructural evolution of alpha and beta phases during dynamic globularization of near-beta Ti-13Nb-13Zr alloy was investigated to determine the optimum processing conditions. The submicrocrystalline alloy sheet with ~80% of high-angle grain boundaries was produced utilizing dynamic globularization at temperature of 600℃, equivalent strain rate of 10<SUP>-1</SUP> s<SUP>-1</SUP> and strain of 1.4. The refined structure with the grain size of ~0.4 ㎛ showed 25-60% enhanced mechanical compatibility as compared to those of the conventional mill-annealed or solution treated and aged microstructures.
박찬희(C. H. Park),이종수(C. S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
The current understanding for phase/grain boundary sliding and low-temperature/high-strain rate superplasticity of two-phase titanium alloys is summarized. The quantitative analysis on boundary sliding revealed increased sliding resistance on the order of α/β≪α/α?β/β boundary, hence, led to the conclusion that approximately 50% alpha(or beta) volume fraction and/or grain refinement is beneficial for obtaining large superplastic elongation at low temperature and/or high strain rate. To predict the temperature for 50% alpha volume in various alpha/beta Ti, artificial neural network was applied. Finally, much enhanced superplasticity was achieved through grain refinement utilizing dynamic globularization.