The boron effect on the superplastic deformation of Ni3(Si,Ti) alloys
The boron effect on the superplastic deformation of Ni3(Si,Ti) alloys
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硼对Ni3(Si,Ti)合金超塑性变形的影响
DOI：
10.1016/0956-716x(91)90243-t
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
S. Hanada
中科院分区：
文献类型：
--
作者：
T. Takasugi;S. Rikukawa;S. Hanada
该论文报道，添加少量硼有利于Li{sub 2}型Ni{sub 3}Al有序金属间化合物的室温延展性，而Li{sub 2}型Ni{sub 3}Al有序金属间化合物本质上是脆性的。这种有益效果归因于硼偏析到晶界，从而抑制了脆性晶间断裂。最近发现，硼掺杂的Ni{sub 3}Al合金表现出较大的高温拉伸延展性，即当这些合金在相对细的晶粒尺寸和适当的应变速率下进行测试时表现出超塑性。然而，这一事实并不总是意味着硼的添加也有利于该合金的高温延展性。这里，向Ni{sub 3}Al合金中添加硼的作用是通过冷加工储存足够量的应变能，从而通过连续再结晶获得导致超塑性的细晶粒微观结构。只有将掺硼材料与未掺硼材料的高温拉伸塑性进行比较，才能阐明硼对超塑性变形的影响。
This paper reports that the addition of a small amount of boron is beneficial to room temperature ductility of Li{sub 2}-type Ni{sub 3}Al ordered intermetallics which were inherently brittle. This beneficial effect was attributed to boron segregation to grain boundaries by which its brittle intergranular fracture was suppressed. It was recently found that boron-doped Ni{sub 3}Al alloys exhibited large high temperature tensile ductility, i.e. the superplasticity when these alloys were tested in a relatively fine grain size and at an appropriate strain rate. However, this fact does not always mean that the addition of boron is beneficial also to high temperature ductility of this alloy. Here, the effect of the addition of boron into Ni{sub 3}Al alloys was that a sufficient amount of strain energy was stored by cold working and thereby fine grain microstructure resulting in the superplasticity was obtained by successive recrystallization. The boron effect on the superplastic deformation may be clarified only when high temperature tensile ductility of boron-doped material is compared with that of boron-undoped material.