By J. H. Westbrook, R. L. Fleischer
This quantity is one in every of 4, every one of which is composed of reprinted chapters from the hugely acclaimed, entire two-volume set Intermetallic Compounds: rules and perform, released in 1995. every now and then the writer or authors have additional a quick addendum to carry their bankruptcy brand new and in different circumstances more moderen references were further. Chapters were chosen and grouped in topic components to supply extra simply available and uncomplicated volumes for person researchers. the opposite titles during this four-volume set are: Crystal constructions of Intermetallic Compounds Structural functions of Intermetallic Compounds Magnetic, electric and Optical houses and functions of Intermetallic Compounds
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Extra info for Intermetallic Compounds, Volume 2, Basic Mechanical Properties and Lattice Defects of
Fracture along the grain boundaries in a polycrystalline sample. Examples are shown in Figure 1. Significant research efforts in recent years have been directed at trying to ductilize these compounds so that they can be used. These efforts have focused primarily on trying to find alloying additions that will impart ductility to the matrix or, specifically for compounds that fail inter granular Iy, an additive that will segregate to the grain boundaries and increase cohesion across them. A review of the literature shows that the details of the fracture process and the attempts to improve ductility vary from system to system, and that there are many individual reports on ductility and fracture in specific compounds.
And Koiwa, M. (1996a). Phil. Mag. , 73, 71. , and Koiwa, M. (1996b). Phil. Mag. A, 73, 1475. , and Koiwa, M. (1997). Mater. , A239-240, 188. Chapter 2 Intergranular and Cleavage Fracture Clyde L. Briant General Electric Company, Research and Development Center, PO Box 8, Schenectady, New York 12301, USA (now at Division of Engineering, Brown University, Box D, 182 Hope St, Providence, Rhode Island 02912-9104, USA) 1. Introduction One of the most limiting properties of many intermetallic compounds is their brittleness at room temperature.
There are other Ll 2 compounds that fail by cleavage and that are formed by making significant alloying additions to nonLl2-based compounds. ) The few compounds that are ductile are usually composed of two transition metals. Given that these compounds should be ductile, based on slip requirements, one must explain why so many of them are brittle. It is easy to explain how intergranular fracture might occur. A stress concentration builds up at the grain boundary from dislocation pile-ups and nucleates an intergranular crack.