(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 利用在線熱軋−淬火工藝和隨后的形變熱處理工藝制備Cu-Cr系列合金帶材，并采用硬度、電導(dǎo)率測(cè)試與光學(xué)顯微鏡、透射電子顯微鏡觀察的方法，研究合金在制備加工過(guò)程中的性能和組織演變。結(jié)果表明：在線熱軋−淬火和后續(xù)的形變熱處理工藝可成功地制備高硬度、高導(dǎo)電和抗軟化性能優(yōu)異的Cu-Cr系合金帶材。具有有序FCC結(jié)構(gòu)、與基體呈立方−立方位向關(guān)系的Cr相從過(guò)飽和固溶體中分解出來(lái)是時(shí)效過(guò)程中合金硬度和電導(dǎo)率提高的原因。Cu-Cr系合金的高硬度是細(xì)晶強(qiáng)化、應(yīng)變強(qiáng)化和析出強(qiáng)化共同作用的結(jié)果，而高電導(dǎo)率是由于時(shí)效析出極大地降低了基體中溶質(zhì)原子濃度。
關(guān)鍵字: Cu-Cr系合金；熱軋−淬火；析出相；強(qiáng)化；抗軟化性能
WU Yi-feng1, 2, DONG Qi-yi1, 2, WEI Hai-gen1, 2
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The strips of Cu-Cr system alloys were manufactured by online hot rolling-quenching (HR-Q) and subsequent thermomechanical treatments process. The properties and microstructure evolution of alloys were investigated by measurements of microhardness and electrical conductivity, and observations of optical microscopy (OM) and analytical transmission electron microscopy (TEM). The results show that the HR-Q and thermomechanical treatments process can successfully manufacture the strips of Cu-Cr system alloys with high hardness, high conductivity and excellent softening resistance. The Cr precipitates with ordered FCC structure, which are decomposed from the thermomechanically treated alloys, are responsible for the improvement of properties during near peak aging. The high hardness of the alloys is ascribed to the interactions of grain boundary strengthening, strain hardening and precipitation hardening, and the high electrical conductivity results from the reduction of the solute atoms concentration in the matrix during aging treatment.
Key words: Cu-Cr system alloy; hot rolling-quenching; precipitate; hardening; softening resistance
