Microscopy and tensile behavior of melt-spun Ni-Al-Fe alloys
Microscopy and tensile behavior of melt-spun Ni-Al-Fe alloys
复制标题
熔纺 Ni-Al-Fe 合金的显微镜观察和拉伸行为
DOI：
10.1007/bf02656580
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
D. D. Krueger
中科院分区：
文献类型：
--
作者：
Shyh;R. Field;D. D. Krueger
对快淬态和退火态Ni-20（at. pet）含20 - 40 Fe的Al-Fe合金。薄带具有由有序bec β-NiAl晶粒和无序fee γ-Ni晶粒组成的复相组织，其中含有γ′-Ni 3Al相。25 - 30 Fe合金在初纺态和退火态都表现出高的延展性（伸长率为1000 pet）。这些结果表明，快速凝固诱导的效果，如有序的抑制，不提高延性，如以前报道的。结果表明，韧性合金的β相和β相均含有较高的位错密度，而β相中没有应力诱发马氏体的形成。位错分析表明，β中绝大多数位错的Burgers矢量≤100≥;然而，也观察到≤111≥位错。此外，经常观察到滑移带在γ-β晶界处相遇。由于它们倾向于在相间晶界上对齐，因此推断出γ和β之间的变形传递。晶粒之间的特定取向关系有利于变形传递。ββ通过≤111≥滑移和相邻晶粒的变形传递而产生的异常变形可能是高塑性的原因。
Microscopy and room-temperature tensile tests were performed on as-spun and annealed ribbons of Ni-20 (at. pet) Al-Fe alloys containing 20 to 40Fe. The ribbons had the duplex structures consisting of grains of ordered bec β-NiAl and grains of disordered fee γ-Ni, which contains precipitates of γ′-Ni3Al. The 25 to 30Fe alloys exhibited high ductility (∼10 pet elongation) in both the as-spun and annealed conditions. These results indicate that rapid solidification-induced effects, such as the suppression of ordering, do not enhance ductility as previously reported. The ductile alloys were found to contain high dislocation densities in both theyand β grains, with no evidence of stress-induced martensite formation in the β phase. Dislocation analysis revealed that the vast majority of dislocations in theβhad ≤100≥Burgers vectors; however, ≤111≥ dislocations were also observed. Additionally, slip bands were frequently observed meeting at γ-βgrain boundaries. Since they tend to align across the interphase grain boundary, deformation transfer between γ and β is inferred. The deformation transfer was found to be facilitated by a specific orientation relationship between the grains. The unusual deformation of ββby ≤111≥ slip and by deformation transfer from neighboring grains may be responsible for the high ductility.