退火对Ni-W合金药型罩组织与性能的影响

Effect of Annealing on the Microstructure and Mechanical Properties of Nickel-Tungsten Alloy Liner for Shaped Charge

摘要:

用电沉积方法制备了含钨1.76%(质量分数)的Ni-W合金药型罩。通过拉伸试验对原始电铸态和热处理后样品的力学性能进行了评价，并利用X射线衍射、透射电子显微镜、俄歇电子能谱等技术对原始电铸态和热处理后样品的微观结构进行了分析。结果表明，通过电铸技术制备的Ni-W合金药型罩材料强度较高，晶粒细小并具有 (111)织构。制备的Ni-W合金仍具有面心立方结构，W固溶在Ni的晶格中。Ni-W合金药型罩材料经300 ℃退火后，晶粒发生异常长大，(111) 织构转变为 (220) 织构。经500 ℃退火后，由于硫在晶界的偏析，发生沿晶断裂，严重影响了材料的力学性能

Abstract:

A Ni-1.76 wt%W alloy liner for shaped charge was prepared by means of electrodeposition. The microstructure of the as-deposited and as-annealed alloys was examined by X-ray diffraction, transmission electron microscope and Auger electron spectroscopy technique. Mechanical properties of alloys were evaluated by tensile tests. The results demonstrate that the electrodeposited alloy has high strength, fine grains and a strong (111) texture. The prepared Ni-W alloy still has fcc structure and W is solid solutioned in Ni lattice. By annealing at 300 °C, abnormal grain growth appears in the sample. (111) texture weakens and (220) texture tends to appear. At 500 °C, sulfur segregation at grain boundary has a detrimental effect on the tensile properties of the alloy.