CAJ | 학술논문

制备了Cu-10Cr和Cu-10Cr-0.4Zr合金,并经冷变形形成了原位复合材料.研究Zr添加剂对合金铸态组织和复合材料的纤维形貌的影响,以及随着形变率的提高β-Cr纤维演变特征.研究表明,在Cu-10Cr合金中添加的0.4%(质量分数)Zr,Cr析出相的直径由15～80μm细化到10～20μm;对Cu-10Cr-0 4Zr合金能谱分析表明,在Cu-10Cr-0.4Zr铸态组织中存在Cu_5Zr相的形成和析出;随着形变率增大,β-Cr相之间的间距不断减小,其宽厚比也进一步增大,纤维相发生比较明显的弯曲和扭折,特别是当形变率η=6.2时,纤维相的厚度能够达到250～350nm,纤维相变形和分布也趋于均匀;当η=6.2时,Cu-10Cr-0.4Zr形变复合材料的抗拉强度达到1089MPa,采用改进的Hall-Petch公式计算其值为1037MPa,理论计算数值与观测结果基本一致.
제비료Cu-10Cr화Cu-10Cr-0.4Zr합금,병경랭변형형성료원위복합재료.연구Zr첨가제대합금주태조직화복합재료적섬유형모적영향,이급수착형변솔적제고β-Cr섬유연변특정.연구표명,재Cu-10Cr합금중첨가적0.4%(질량분수)Zr,Cr석출상적직경유15～80μm세화도10～20μm;대Cu-10Cr-0 4Zr합금능보분석표명,재Cu-10Cr-0.4Zr주태조직중존재Cu_5Zr상적형성화석출;수착형변솔증대,β-Cr상지간적간거불단감소,기관후비야진일보증대,섬유상발생비교명현적만곡화뉴절,특별시당형변솔η=6.2시,섬유상적후도능구체도250～350nm,섬유상변형화분포야추우균균;당η=6.2시,Cu-10Cr-0.4Zr형변복합재료적항랍강도체도1089MPa,채용개진적Hall-Petch공식계산기치위1037MPa,이론계산수치여관측결과기본일치.
The Cu-10Cr alloy, Cu-10Cr-0.4Zr alloy and the in-situ composite based on the alloys were prepared.Microstructures of as-cast, structural evolution characteristics of Cu-10Cr-0.4Zr in-situ composites were investigated.The results showed that the addition of 0.4%(mass fraction)Zr in the Cu-10%Cr gave birth to smaller as-cast Cr dendrites, their diameters were reduced from 15-80μm to 10-20μm; the EDS quantitative analysis of as-cast Cu-10Cr-0.4Zr alloy showed that the Zr-rich phase should be Cu_5Zr; with the increasing of drawing strains, the spacings among the β-Cr phases decreased gradually and the thickness of β-Cr phases decreased rapidly, the β-Cr phases were constrained to fold and twist, particularly at η=6.2, the thickness reached 250-350nm; at η=6.2, the predicted strength using Hall-Petch equation was 1037MPa,which was good agreement with the observed strength 1089MPa.