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根据最近对固溶体强度研究的结果认为:合金元素原子在固溶体中并不是均匀地无序的分布着,而是经常形成有近程序的集团。例如Rudman等曾证明在许多合金中(如Ni-Au)都存在原子之集聚。在以镍铬合金为代表的一系列固溶体中K状态之存在很可能也反映了以上这种规律。很早就发现(Thomas)在许多合金中(如Ni-Cr,Ni-Al,Ni-Cu,Fe-Al,Fe-Si等)电阻的变化十分反常:冷加工导致他们的电阻率减少而随后的回火重新使电阻率上升。金相及x光分析证明这种状态是单相的,因此这种状态(一般称为K状态)一定是相应于原子分布的不均匀性。之后等利用电阻、热膨胀、硬度及组织分析详细的研究了这一现象的动力学过程,他认为建立K状态相当于一种“无析出的时效”,其结果就破坏了固溶体之均匀性而在固溶体晶格
According to the recent study of the solid solution strength, alloying elemental atoms are not uniformly disordered in the solid solution, but are often formed near the program group. For example, Rudman et al. Have demonstrated the presence of atomic agglomeration in many alloys (such as Ni-Au). The existence of K state in a series of solid solution represented by Ni-Cr alloy probably reflects the above rule. It has long been found that the variation of the resistance of Thomas in many alloys such as Ni-Cr, Ni-Al, Ni-Cu, Fe-Al, Fe-Si etc. is quite abnormal: cold working leads to a decrease of their resistivity, Tempering again to increase the resistivity. Metallography and x-ray analysis show that this state is single-phase, so this state (generally called the K state) must be non-uniform corresponding to the atomic distribution. After that, the kinetic process of this phenomenon has been studied in detail using resistance, thermal expansion, hardness and microstructure analysis. He believes that establishing K state is equivalent to a “non-precipitation aging”, which results in disruption of the homogeneity of the solid solution Solid solution crystal lattice