Forming property for coin striking and ornamental stamping Which material property is most essential for processes such as forging, stamping images on coins, and producing intricate ornamental work where extensive compression and hammering are involved?

Introduction / Context:
Different forming operations stress different mechanical properties. Coining, embossing, and ornamental die work demand large compressive deformation without cracking while capturing fine surface detail. Choosing the correct property term prevents confusion between tension-dominated and compression-dominated forming characteristics.

Given Data / Assumptions:

• Operations: forging, coining, stamping (primarily compressive).
• Objective: resist cracking while undergoing large shape change.
• Metals considered include gold, silver, copper alloys, and low-carbon steels.

Concept / Approach:
Malleability = ability to undergo extensive plastic deformation in compression (e.g., rolling, hammering) without fracture.It is distinct from ductility, which emphasizes plastic deformation in tension (e.g., wire drawing). Plasticity is the broader umbrella term for permanent deformation after yielding, while elasticity is recoverable strain only. Resilience is the capacity to store and release elastic energy, not desirable in coining where permanent impression is required.

Step-by-Step Solution:

Verification / Alternative check:
Materials famous for coining (e.g., annealed gold, silver, copper) are known to be highly malleable, enabling deep impressions without cracking.

Why Other Options Are Wrong:

• Elasticity/resilience: imply spring-back, which is counterproductive for imprint retention.
• Plasticity: too general; does not specify compressive formability.
• Ductility: tension-oriented definition; coins are not wire-drawn.

Common Pitfalls:
Using “ductile” to describe good forging behavior; ignoring that malleability is the compression counterpart.

Final Answer: