的時(shí)效分解及對(duì)電阻率的影響
( 1. 西安交通大學(xué) 理學(xué)院, 西安 710049；
2. 西安交通大學(xué) 金屬材料強(qiáng)度國(guó)家重點(diǎn)實(shí)驗(yàn)室, 西安 710049)
摘 要: 用熔體快淬法制備了Cu100-xCrx（x＝2～35）合金帶。研究表明：熔體快淬帶的組織由Cr在Cu中的過(guò)飽和固溶體、富Cr溶質(zhì)偏聚區(qū)、富Cr液相分解粒子組成；含Cr量增加，液相分解粒子體積分?jǐn)?shù)增加，電阻率提高；過(guò)飽和固溶體在等溫時(shí)效過(guò)程中短時(shí)間內(nèi)（10 min）快速分解完畢，合金帶的電阻率大幅下降，延長(zhǎng)時(shí)效時(shí)間，富Cr沉淀相尺寸長(zhǎng)大緩慢；時(shí)效溫度升高，富Cr沉淀的尺寸略有增大，電阻率在600 ℃時(shí)效達(dá)到最小值。
關(guān)鍵字: Cu-Cr合金； 熔體快淬； 時(shí)效； 微觀組織； 電阻率
Cu100-xCrx ribbons
ZHU Rui-hua2
（ 1. School of Science, Xi′an Jiaotong University, Xi′an 710049, China；
2. State Key Laboratory for Mechanical Behavior of Materials,
Xi′an Jiaotong University, Xi′an 710049, China）
Abstract: Cu100-xCrx（x＝2-35）ribbons were prepared by melt spinning. The results reveal that the microstructures of the ribbons are consisted of supersaturation solid solution of Cr in Cu solution, Cr-riched segregation regions and Cr-riched liquid phase separation particles. The volume fractions of Cr-riched liquid phase separation particles and the resistivity of the ribbons increase with the increasing Cr contents. The supersaturation is solid solution separated rapidly in isothermal annealing within 10 min, resulting in the decline of resistivity. The Cr-riched precipitations grow slowly as the annealing time is prolonged, however they will grow up slightly when the ribbons are annealed at higher temperature. The least resistivity can be obtained when the ribbons are annealed at 600 ℃.
Key words: Cu-Cr alloy; melt-spun; aging; microstructure; resistivity
