论文部分内容阅读
选择ＣｕＮｉＦｅ合金系为研究对象，用光学显微镜和透射电子显微镜对固溶处理和时效组织进行了观察，以探索失稳分解法制备双相纳米晶合金的可行性。其中４８Ｃｕ３０Ｎｉ２２Ｆｅ（摩尔分数，％）的合金成分满足制备双相纳米晶合金的条件：在高温下为单相固溶体，在适当的低温能失稳分解成两相体积分数大致相等的组织，而且这种组织中彼此相隔的两相都可控制在纳米量级。该合金经１１７０℃固溶处理，６００℃时效后可以获得纳米量级的双相组织。该合金的熔点为１１７０～１２００℃，失稳分解的临界点为８５０～９５０℃。
Select Cu Ni Fe alloy system as the research object, using optical microscopy and transmission electron microscopy of the solution treatment and aging organizations were observed in order to explore the instability of the feasibility of preparation of binary nanocrystalline alloys. Which 48Cu 30Ni 22Fe (mole fraction,%) of the alloy composition to meet the conditions for the preparation of two-phase nanocrystalline alloy: at high temperature single-phase solid solution, at low temperature instability can be decomposed into two-phase volume fraction of approximately equal tissue , And the two phases in the tissue that are separated from each other can be controlled at the nanometer scale. The alloy after solution treatment at 1170 ℃, 600 ℃ aging can be obtained on the order of nanoscale duplex. The melting point of the alloy is 1170 ~ 1200 ℃, instability decomposition of the critical point of 850 ~ 950 ℃.