摘要
采用电铸法制备了纳米晶Ni-W合金,并进行了250～500℃×1h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。
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.
出处
《热加工工艺》
CSCD
北大核心
2010年第24期212-215,共4页
Hot Working Technology
基金
北京市教委资助项目(JJ009001201001)
校级基地资助项目(X3009001200801)
关键词
电铸
纳米晶Ni-W
退火
electroforming
nano-crystalline Ni-W
annealing
