退火对电铸纳米晶Ni-W合金组织和性能的影响
Effects of Annealing on Microstructure and Properties of Electroformed Nano-crystalline Ni-W Alloy
冯昌川, 范爱玲, 王 维, 马 捷
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作者单位：(北京工业大学 材料学院, 北京 100124)
中文关键字：电铸； 纳米晶Ni-W； 退火
英文关键字：electroforming; nano-crystalline Ni-W; annealing
中文摘要：采用电铸法制备了纳米晶Ni-W合金，并进行了250～500 ℃ × 1 h的真空退火处理。采用激光共聚焦扫描显微镜、扫描电子显微镜、X射线衍射仪和显微硬度计等对Ni-W合金退火前后的微观组织和显微硬度进行了研究。结果表明：随退火温度的升高，纳米晶Ni-18%W合金的组织趋于均匀化；晶粒尺寸逐渐增大，从退火前的6.80 nm长大到500 ℃退火时的12.56 nm；在300、400和500 ℃退火后，有少量Ni4W相析出；在低温退火时，合金的显微硬度随退火温度的升高而升高，300 ℃时达到最大值，然后随退火温度的继续升高而降低。
英文摘要：The nano-crystalline Ni-W alloy was prepared by electroforming method. And then the alloy was vacuum annealing treatment at 250 ℃～500 ℃ for 1 h. The microstructure and mechanical properties of the samples before and after annealing treatment were studied using LSCM, SEM, XRD and microhardness tester. The results indicate that the microstructure of the nano-crystalline Ni-18wt%W alloy is tending towards homogeneous with the increase of annealing temperature; the grain size of the alloy increases from 6.80 nm to 12.56 nm when the annealing temperature rise to 500 ℃; the harden phase Ni4W is precipitated after annealed at 300 ℃, 400 ℃and 500 ℃; the microhardness of the alloy increases gradually after annealing at low temperatures and reaches the maximum at 300 ℃, then decreases with the increase of the annealing temperature.