快速凝固Cu-2.8Ni-0.7Si合金薄带的时效相变行为  

Aging Behavior of the Cu-2.8Ni-0.7Si Alloy Ribbons Prepared by Single Roller Spinning Quenching Method

作　　者：张蔚冉[1] 耿桂宏[1] 刘利盟[1] 邹成路[1] 薛鹏皓 

机构地区：[1]北方民族大学材料科学工程学院

出　　处：《特种铸造及有色合金》2016年第11期1229-1232,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51561001);宁夏高等学校科研资助项目(NGY20140132)

摘　　要：采用单辊旋淬快速凝固法制备了50~150μm厚的Cu-2.8Ni-0.7Si合金薄带,研究了时效温度和时效时间对其电导率和抗拉强度的影响。结果表明,在同一时效温度下,随着时效时间的延长,Cu-2.8Ni-0.7Si合金薄带的电导率不断增大,抗拉强度则是先升高后降低。时效峰值过后,抗拉强度下降的速度随时效温度的增大而增大。Cu-Ni-Si合金时效过程中,电导率增量与δ-Ni_2Si相的析出量存在线性关系,通过测量电导率能确定δ-Ni_2Si相的析出,确定了新相析出率的Avrami相变动力学方程和该铜合金薄带中δ-Ni_2Si相析出的电导率方程,并计算拟合了析出相与时效时间的动力学曲线。Cu-based Cu-2.8Ni-0.7Si alloy ribbons with 50~150μm in thickness and smooth surface were prepared by single roller spinning quenching method.The ribbons prepared were heat treated at 400~500 ℃for varied time.Effects of the temperature and aging time on the electrical conductivity and tensile strength of the ribbons were investigated.The results reveal that electrical conductivity of the ribbons is increased gradually while tensile strength is increased firstly and then decreased with the aging time increase at the fixed temperature,and the tensile strength after peak aging is increased with the increase of aging temperature.The electrical conductivity of the ribbons is increased linearly with the contents ofδ-Ni_2Si as the precipitation phase.Dynamics of theδ-Ni_2Si phase formation was estimated by the Avrami equation,and electric conductivity equation of precipitatingδ-Ni_2Si phase from the Cu alloy ribbons was determined.In addition,the dynamic curves of the relations between precipitation and aging times were calculated.

关 键 词：Cu-2.8Ni-0.7Si合金 时效处理 抗拉强度 电导率 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG166.2[金属学及工艺—金属材料]