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一、前言 Ni_3Al由于具有一系列的优异性能而受到材料科学工作者的重视。为了克服Ni_3Al的脆性和提高其强度,人们广泛研究了合金元素在Ni_3Al中的作用。硼的微合金化可使Ni_3Al室温塑性明显提高,以致于可以成功地冷轧出薄板。锆可以明显提高Ni_3Al的屈服强度,然而锆对无硼Ni_3Al强度的影响尚无系统资料,对无硼Ni_3Al塑性影响尚不清楚,为此,本文系统地研究了Al+Zr含量分别为26,24.5和22.5at％条件下,不同Zr含量(0～2.5at％)对Ni_3Al合金在室温至85O℃高温下组织性能的影响。 二、试验方法 试验用合金采用真空钮扣非自耗炉熔炼成100g的小锭,然后制成5mm×5mm×7mm压缩试样,分别在室温,400,600,700,850℃进行压缩变形试验,用1Okg真空感应炉进行熔炼并浇注成精铸标准拉伸试样,测定室温,600℃和85O℃拉伸性能,试验合金的化学成分列于表1。用金相方法观察合金的组织,用扫描电镜检查合金压缩试样表面变形特征,裂纹情况及拉伸试样断口特征。
First, the preface Ni_3Al due to a series of excellent performance by the material science workers attention. In order to overcome the brittle Ni_3Al and improve its strength, extensive study of the role of alloying elements in Ni_3Al. Micro-alloying of boron can improve the room temperature plasticity of Ni_3Al so that the sheet can be cold-rolled successfully. However, the effect of zirconium on the strength of boron-free Ni_3Al is still unknown. The influence of zirconium on the plasticity of Ni_3Al is not clear. Therefore, the content of Al + Zr in this paper was studied systematically to 26,24.5 And 22.5at%, different Zr content (0 ~ 2.5at%) on the microstructure and properties of Ni_3Al alloy at room temperature to 85O ℃ high temperature. Second, the test method The test alloy with a vacuum button non-consumable furnace smelt into 100g of small ingot, and then made 5mm × 5mm × 7mm compression test, respectively, at room temperature, 400,600,700,850 ℃ compression deformation test, with 1Okg vacuum induction furnace Smelting and pouring into casting standard tensile specimens, measuring room temperature, 600 ℃ and 85O ℃ tensile properties, the chemical composition of the test alloy are shown in Table 1. The microstructure of the alloy was observed by metallographic method. The deformation characteristics, cracks and the fracture characteristics of the tensile specimen were examined by scanning electron microscopy.