摘要
采用真空感应熔炼法制备Mn65-Cu23.75-Zn3-Al3-Ni3-Fe2-Ce0.05(at%)合金。对该合金进行轧制处理,然后进行均匀化退火。分别在850℃和950~1050℃对合金进行普通固溶及半固态固溶处理,随后在430℃时效0~16 h。研究半固态固溶温度及时效时间对Mn-Cu合金组织、阻尼性能和力学性能的影响。结果表明:普通固溶合金组织由单一γ-Mn Cu相构成,而半固态固溶合金组织则由富Mn和贫Mn的γ-Mn Cu相构成,且随着半固态固溶温度的升高,贫Mn相的含量不断增加。合金阻尼性能随时效时间的延长呈现出先上升后下降趋势。在最优时效条件下,较低的半固态固溶温度可提高合金的阻尼性能,而较高的半固态固溶温度则会降低其阻尼性能。和S850合金相比,S950合金的强塑积提高了约70%。但随着半固态固溶温度的升高,合金强塑积又有所下降。
Mn65-Cu23.75-Zn3-Al3-Ni3-Fe2-Ce0.05(at%)alloy was prepared by vacuum induction melting method,and then rolled at 400 oC with a height reduction of 40%and further annealed at 800 oC for 5 h.The alloy samples were solid solution and semi-solid solution treated at 850 oC and 950~1050 oC for 20 min,respectively,and then aged at 430 oC for 0~16 h.The effects of semi-solid solution temperature and aging time on the microstructure,damping capacity and mechanical properties of Mn-Cu alloys were studied.The results show that the microstructure of solid solution treated alloy is composed of a singleγ-Mn Cu phase,while that of the semi-solid solution treated one comprises Mn-rich and Mn-poorγ-Mn Cu phases.The amount of Mn-poorγ-Mn Cu phase gradually rises with the increase in semi-solid solution temperature.The damping capacity of the alloy firstly increases and then deceases with the increase of aging time.Under optimal aging conditions,the damping capacity of the alloy is improved at a relatively lower semi-solid solution temperature while degraded at a relatively higher semi-solid solution temperature.The tensile properties of the alloys semi-solid solution treated at 950 and 1000 oC are improved compared to the alloy solid solution treated at 850 oC(especially,the product of strength and ductility of S950 alloy is 70%higher than that of S850 one).However,the product of strength and ductility of the alloy decreases instead with further increase in semi-solid solution temperature.
作者
尤卫星
张松
胥永刚
邓明红
胥晓强
曾琪皓
You Weixing;Zhang Song;Xu Yonggang;Deng Minghong;Xu Xiaoqiang;Zeng Qihao(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第3期979-987,共9页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51701167)。
关键词
Mn-Cu合金
半固态固溶
时效
阻尼性能
力学性能
Mn-Cu base alloy
semi-solid solution
aging
damping capacity
mechanical properties
