【作者】 胡勇；

【导师】 范志康；

【作者基本信息】 西安理工大学 ， 材料加工工程， 2003， 硕士

【摘要】 分别在氮气、氩气、真空环境下制备了多种成分的Cu-Cr合金。对合金上表面进行了XRD分析，并进行了相应的热力学计算；研究了在非平衡凝固条件下各成分Cu-Cr合金中Cr相的组织形貌；测试了氩气环境下熔炼制备的CuCr1.40合金的力学及电学性能；测试了氩气环境下熔炼制备的CuCr0.89合金、CuCr1.40合金在350℃时的拉伸性能。结果表明： 1．氮气环境下制备的Cu-Cr合金表面的铬化合物主要是Cr₂N（76at％），还有少量的Cr₂O₃和Cr₇C₃；氩气环境下制备的Cu-Cr合金表面的铬化合物仅有Cr₇C₃（35at％）。氮气环境下制备的合金的表面铬化合物数量明显较氨气环境下的多。 2．Cu-Cr合金的共晶Cr的形貌主要有球状和杆状两种，随着Cr含量的增加，共晶Cr从主要以球状形式存在转变为主要以杆状形式存在；当Cr含量达到4.20wt％时，共晶Cr几乎完全以杆状形式存在，且有部分Cr杆呈“飘带”状。 3．氩气环境下制备的CuCr1.40合金在常温下具有良好的综合性能，尤其经锻造+固溶时效处理后，不仅具有很高的抗拉强度（425MPa），还保持了很高的延伸率（32.7％）。 4．Cu-Cr合金在350℃时的拉伸性能较常温时明显降低：固溶时效CuCr0.89合金、CuCr1.40合金的抗拉强度分别下降了12.6％和22.7％，延伸率分别下降了61.3％和86.2％：锻造+固溶时效CuCr1.40合金的抗拉强度和延伸率分别下降了40％和69.4％。更多还原

【Abstract】 Cu-Cr alloys with various component were prepared by atmosphere-melting technique in N2, Ar and vacuum conditions respectively. The upper surfaces of alloy were analyzed by XRD , and relevant thermodynamics calculations were carried out; The non-equilibrium microstructure of Cr phase in Cu-Cr alloy with various component were investigated; Mechanical and electrical properties of CuCrl.40 alloy prepared by melting in Ar atmosphere were tested; and tensile property of CuCrO.89 and CuCrl.40 alloy prepared by melting in Ar atmosphere were tested(350癈). The result showed:1. The Cr-compound on the surface of Cu-Cr alloy prepared by melting in N2 protected atmosphere was mainly C^N (76at%) , and a spot of CraOj and Cr7C3; the Cr-compound was mainly Cr7C3(35at%) in N2 protected atmosphere. The Cr-compound on the surface of Cu-Cr alloy prepared by melting in ty protected atmosphere was evidently more than in Ar protected atmosphere.2. The morphological typing of eutectic Cr of Cu-Cr alloys were sphericity and rod-shaped. With the increase of Cr content, the morphological typing of eutectic Cr were transformed from sphericity to rod-shaped. When the amount of Cr content reached 4.20wt%, eutectic Cr in rod form was primary, and some ribbon of Cr was found.3. CuCrl. 40 alloy had excellent combination property at normal temperature, which were prepared by melting in Ar protected atmosphere. After forging process, CuCrl.40 alloy had not only high- tensile strength(425MPa), but also high-IIelongation(32.7%).4. The tensile property of high-temperature (350"C) of Cu-Cr alloys, comparing with normal temperature, obviously fell. CuCrO.89 alloy and CuCrl.40 alloy’s(after solution treatment and aging) tensile strength had fallen with 12.6% and 22.7% respectively. CuCrl.40 alloy’s(after forging process and solution treatment and aging) tensile strength and elongation had fallen with 61.3% and 86.2% respectively.更多还原