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.
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.
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