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采用电子束物理气相沉积技术制备NiCoCrAl合金薄板,研究热处理对合金薄板的微观结构和拉伸强度的影响。制备态的合金薄板具有柱状晶结构,柱状晶间存在间隙。经1050°C热处理,柱状晶间的间隙消失,从而导致柱状结构间的结合强度提高;新相Ni3Al在合金中析出,这有助于提高柱状结构间的结合强度。热处理后,合金薄板中残余应力减少,证明薄板中柱状结构间的界面结合有改善。柱状结构间结合强度的提高最终导致合金薄板的拉伸强度和伸长率的提高。
NiCoCrAl alloy sheets were prepared by electron beam physical vapor deposition technique to study the effect of heat treatment on the microstructure and tensile strength of the alloy sheets. The prepared alloy sheet has a columnar crystal structure with gaps between the columnar crystals. After heat treatment at 1050 ° C, the interstices between the columnar crystals disappear, leading to an increase in the bonding strength between the columnar structures. The new phase Ni3Al is precipitated in the alloy, which helps to improve the bonding strength between the columnar structures. After heat treatment, the residual stress in the alloy sheet decreases, demonstrating that the interfacial bonding between the columnar structures in the sheet improves. The increased bonding strength between the columnar structures eventually leads to an increase in the tensile strength and elongation of the alloy sheet.