(1. 上海交通大学 材料科学与工程学院，上海 200240；
2. 上海交通大学 高新船舶与深海开发装备协同创新中心，上海 200240；
3. 上海似德精密机械制造有限公司，上海 201611)
摘 要: 通过形变量为75%的温轧形变热处理，制备了一种超细组织的QAl10-4-4镍铝青铜合金，研究其微观组织与力学性能。结果表明：经大变形温轧后，温轧后的镍铝青铜材料由超细层状(α+β′)双相组织以及细小的k相组成(其中α相为铜基固溶体、β′相为共析相变受阻产生的Cu3Al基马氏体及NiAl析出相、k相为Fe3Al、NiAl等金属间化合物)，合金的屈服强度由318 MPa提升至1020 MPa，抗拉强度由784 MPa提升至1104 MPa，具有7.8%的均匀伸长率并呈现良好的应变硬化能力。温轧镍铝青铜合金的高强度主要归因于位错强化、细晶强化以及温轧过程中诱发的纳米析出强化，而良好的塑韧性主要与超细的片层α相和β′相的应力应变协调有关。温轧形变热处理是制备高强韧镍铝青铜合金的一种有效方法。
关键字: 镍铝青铜；高强韧；温轧；组织；力学性能；超细层状结构
（1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Shanghai Jiaotong University, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;
3. Shanghai Seed Machinery Co., Ltd., Shanghai 201611, China）
Abstract:An ultra-fine lamellar-structured QAl10-4-4 aluminum bronze alloy was produced by 70% warm-rolling (WR) and quenching method. The microstructure evolution and mechanical properties of the WRed alloy were investigated. The results show that the microstructures of the produced alloy mainly comprise ultrafine α+β′ lamellar structure and uniformly distributed ultrafine-grained k precipitations. The WRed alloy exhibits excellent comprehensive mechanical properties. The yield strength, ultimate tensile strength of the WRed alloy are dramatically improved from 318 MPa and 784 MPa to 1020 MPa and 1104 MPa, respectively. Furthermore, the alloy still remains uniform elongation of 7.8% and processes very good strain hardening ability. The high strength of the WRed alloy is primarily attributed to the strengthening of dislocation, grain-refinement and nano-sized precipitation induced by warm-rolling processing, and the excellent ductility is mainly associated with the strain coordinating and partitioning between ultrafine lamellar α and β′ phases. It is believed that the warm-rolling and subsequently heat-treating is an effective method to prepare high strength and toughness nickel aluminum bronze alloy.
Key words: nickel aluminum bronze alloy; high strength-ductility; warm-rolling; microstructure; mechanical property; ultrafine lamellar structure
