摘要
合金中Ｎｉ和Ｍｎ的各自含量不低于１５％，另加少量的Ａｌ和Ｔｉ。中频或高频炉熔炼，石墨坩埚，熔炼温度１２５０～１３５０℃，浇注温度１１００～１２００℃，８００～８５０℃热轧，６５０～７００℃中间退火，冷加工率达８０％。淬火温度６５０℃，时效温度４００～４５０℃。最佳性能σｂ＝１４７０ＭＰａ，σ０２＝１３７２ＭＰａ，ＨＶ＝４８０，δ≥２％，Ｅ＝１５３ＧＰａ，ρ＝５４×１０－６Ω·ｃｍ。在４００℃温度下σｂ＝１０００ＭＰａ，σ０２＝８８２ＭＰａ，Ｅ＝１４３ＧＰａ，δ≥２％。弹性后效小于铍铜ＱＢｅ２。时效时进行“Ｓｐｉｎｏｄａｌ”分解，形成调幅结构。经定量分析，析出是属于原子由低浓度区间向高浓度区间的上坡扩散过程。因此，析出相难以聚集长大，故不易产生过时效。
Cu 20Ni 20Mn alloy,as a new kind of Cu based elastic material,has just been studied and successfully manufactured. The alloy has better properties improved by the addition of Al, Ti, Zr, Zn elements etc.The content of Ni is not less than 15%, that of Mn not less than 15%,and the ratio of Ni to Mn is not less than 0.75. The alloy were melted at 1 200～1 350 ℃ in median frequecy induction furnace and cast at 1100～1200 ℃.The ingots were hot rolled at 800～850 ℃ and then annealed at 650～700 ℃.The cold rolling rate was 80%. After quenching (650 ℃)and aging (400～450 ℃),the properties of the alloys were tested: σ b=1 274～1 470 MPa, σ 0.2 =1176～1372 MPa, E =137～153 GPa, δ ≥2%,HV=400～500, ρ ≥54×10 -6 Ω·cm;and σ b=1 000 MPa, σ 0.2 =882 MPa, E =143 GPa, δ ≥2%, under high temperature(400 ℃).The elasticity is less than that of Be brozen. All other properties are higher than those of Be brozen except the ρ value,and it can be used at 400 ℃.By using TEM,the microsturctures were studied and the results showed that the spinodal decomposition could take place and the modulated structure was formed.Due to this upward diffusion decomposition,it is difficult for the precipitation to coarsen.Therefore the overaging phenomenon was not easy to take place in this alloy and the mechanism of the alloy applicable at high temperature can be explained satisfactorily.
出处
《中国有色金属学报》
EI
CAS
CSCD
1996年第4期91-95,共5页
The Chinese Journal of Nonferrous Metals
关键词
铜合金
锰白铜
弹性材料
热处理
elastic Cu based alloy copper high temperature alloy manganese white alloy elastic materials
