Which of the following is NOT a desirable property of a cutting-tool material?

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In the context of cutting-tool materials, properties such as wear resistance, toughness, and hot hardness are pivotal to ensuring optimal performance during machining operations. These properties enhance the tool's longevity and effectiveness when interacting with various materials.

High ductility, however, is not typically desirable in cutting-tool materials. Ductility refers to the ability of a material to deform under tensile stress, which is essential for materials that need to absorb energy or withstand significant deformation, like structural components. In contrast, cutting tools must maintain a rigid structure to effectively cut through materials without bending or deforming. Therefore, while some degree of toughness is necessary to prevent chipping or breaking, excessive ductility could result in the tool being unable to hold a sharp edge and lead to wear or breakage during performance. This is why high ductility does not align with the characteristics needed for high-performance cutting-tool materials.

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