采用静态高压釜腐蚀试验研究了在S5（Zr-0.8Sn-0.4Nb-0.4Fe-0.1Cr）锆合金基础上添加Cu的S5＋x Cu（x=0~0.5,质量分数,%）合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能,用TEM和SEM分别观察了合金和氧化膜的显微组织。结果表明...采用静态高压釜腐蚀试验研究了在S5（Zr-0.8Sn-0.4Nb-0.4Fe-0.1Cr）锆合金基础上添加Cu的S5＋x Cu（x=0~0.5,质量分数,%）合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能,用TEM和SEM分别观察了合金和氧化膜的显微组织。结果表明,在S5合金中添加Cu对其在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能是有害的,特别是当S5合金中添加的Cu含量超过0.2%时,合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能会随Cu含量的增加而急剧恶化,这主要是因为此时合金中含有富铜的Zr_2Cu型相析出,这种Zr_2Cu型相对锆合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能非常有害。展开更多
The role of Cr in affecting the precipitates and the properties of aged Cu−Cr−P alloys was investigated and discussed.The results show that there are mainly three sizes of Cr phase in aged Cu−Cr−P alloys,among them,th...The role of Cr in affecting the precipitates and the properties of aged Cu−Cr−P alloys was investigated and discussed.The results show that there are mainly three sizes of Cr phase in aged Cu−Cr−P alloys,among them,the nano-sized Cr phase plays an important role in the strength of Cu−Cr−P alloys.The strengthening effect of Cr phase(less than 5 nm)with FCC structure completely coherent with the matrix is calculated to be about 200 MPa on the basis of dislocation cut-through mechanism.The strengthening effect of Cr phase(10−20 nm)with BCC structure incoherent with the matrix is calculated to be about 100 MPa on the basis of the Orowan dislocation bypass mechanism.The increase of Cr content changes the number and size of nano-sized Cr phase,which causes the mechanical properties of the Cu−Cr−P alloys to increase first and then decrease.The tensile strength of Cu−0.36Cr−0.01P alloy is 572 MPa and its electrical conductivity is 80%IACS after solid solution treatment at 980°C for 2 h followed by 95%cold rolling and then aging treatment at 450°C for 1 h.展开更多
在Zr-4合金中添加Cu和Mn,用非自耗真空电弧炉熔炼了成分不同的7种锆合金,用高压釜在360℃/18.6MPa/0.01 mol/L Li OH水溶液中和400℃/10.3 MPa过热蒸汽中进行长期腐蚀试验,与出厂退火态Zr-4样品和经过重熔加工的Zr-4样品的耐腐蚀性能进...在Zr-4合金中添加Cu和Mn,用非自耗真空电弧炉熔炼了成分不同的7种锆合金,用高压釜在360℃/18.6MPa/0.01 mol/L Li OH水溶液中和400℃/10.3 MPa过热蒸汽中进行长期腐蚀试验,与出厂退火态Zr-4样品和经过重熔加工的Zr-4样品的耐腐蚀性能进行了比较。结果表明:添加0.05%~0.18%的Cu或0.07%~0.35%的Mn,或同时添加0.08%Cu和0.09%Mn都可以明显改善合金在Li OH水溶液中的耐腐蚀性能,在腐蚀增重曲线上没有出现明显的转折,耐腐蚀性能明显优于Zr-4合金;但是添加Cu或Mn后却使合金在400℃过热蒸汽中的耐腐蚀性能变坏,影响的程度随着Cu或Mn含量的增加而增加,并且Mn的有害作用比Cu更明显。讨论了氧化膜生长各向异性特征与添加合金元素之间的关系,解释了添加Cu和Mn合金元素后对Zr-4合金耐腐蚀性能在不同腐蚀条件下产生不同影响的原因。展开更多
文摘采用静态高压釜腐蚀试验研究了在S5（Zr-0.8Sn-0.4Nb-0.4Fe-0.1Cr）锆合金基础上添加Cu的S5＋x Cu（x=0~0.5,质量分数,%）合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能,用TEM和SEM分别观察了合金和氧化膜的显微组织。结果表明,在S5合金中添加Cu对其在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能是有害的,特别是当S5合金中添加的Cu含量超过0.2%时,合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能会随Cu含量的增加而急剧恶化,这主要是因为此时合金中含有富铜的Zr_2Cu型相析出,这种Zr_2Cu型相对锆合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能非常有害。
基金The authors are grateful for the financial supports from National Key R&D Program of China(2016YFB0301303)Beijing Nova Program,China(Z191100001119125)the National Natural Science Foundation of China(51974028,U1602271).
文摘The role of Cr in affecting the precipitates and the properties of aged Cu−Cr−P alloys was investigated and discussed.The results show that there are mainly three sizes of Cr phase in aged Cu−Cr−P alloys,among them,the nano-sized Cr phase plays an important role in the strength of Cu−Cr−P alloys.The strengthening effect of Cr phase(less than 5 nm)with FCC structure completely coherent with the matrix is calculated to be about 200 MPa on the basis of dislocation cut-through mechanism.The strengthening effect of Cr phase(10−20 nm)with BCC structure incoherent with the matrix is calculated to be about 100 MPa on the basis of the Orowan dislocation bypass mechanism.The increase of Cr content changes the number and size of nano-sized Cr phase,which causes the mechanical properties of the Cu−Cr−P alloys to increase first and then decrease.The tensile strength of Cu−0.36Cr−0.01P alloy is 572 MPa and its electrical conductivity is 80%IACS after solid solution treatment at 980°C for 2 h followed by 95%cold rolling and then aging treatment at 450°C for 1 h.
