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Fracture behavior and microstructure of as-cast NiTi shape memory alloy 被引量:2

铸态镍钛形状记忆合金的断裂行为及显微组织(英文)
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摘要 The as-cast ingot of equiatomic nickel-titanium shape memory alloy (NiTi SMA) was prepared by vacuum consumable arc melting. The tensile tests and the compressive tests with respect to as-cast NiTi SMA were performed to study its mechanical properties of fracture. The microanalysis of as-cast NiTi SMA as well as its fractured samples was performed so as to better understand microstructure evolution and fracture behavior of NiTi SMA. Under tensile loading, the as-cast NiTi SMA shows higher plasticity and is characterized by ductile fracture at 750℃, but it demonstrates poorer plasticity and is characterized by cleavage fracture as well as transcrystalline fracture at room temperature and -100 ℃. Under compressive loading at -100 ~C, the as-cast NiTi SMA is characterized by shear fracture where the normal to the shearing fracture surface inclines about 45° to the compressive axis, and belongs to cleavage fracture where the cracks exoand via transcrvstalline fracture. 通过真空自耗电极熔炼法制备等原子比镍钛形状记忆合金。为了研究其断裂力学性能,进行铸态镍钛形状记忆合金的拉伸和压缩实验。为了更好地理解镍钛形状记忆合金的组织演变及断裂行为,分析铸态镍钛形状记忆合金及其断裂样品的显微组织。在拉伸加载下,镍钛形状记忆合金在750°C时具有较高的塑性,表现为韧性断裂,但在室温和-100°C时表现出较差的塑性,具有解理断裂和穿晶断裂的特征。在-100°C的压缩加载下,铸态镍钛形状记忆合金发生剪切断裂,剪切断裂面法线与压缩轴呈45°,具有解理断裂的特征,裂纹经由穿晶断裂而扩展。
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第6期1401-1406,共6页 中国有色金属学报(英文版)
基金 Project (51071056) supported by the National Natural Science Foundation of China Project (HEUCFR1132) supported by the Fundamental Research Funds for the Central Universities of China
关键词 NiTi altoy shape memory alloy as-cast-NiTi microstructural evolution fracture behavior 镍钛合金 形状记忆合金 铸态镍钛 组织演变 断裂行为
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