A key for operating a mechanical lock, which key includes a head portion for holding by a user, a lock-engaging portion for inserting into the lock for operating the lock by the application of a turning force, and a joining portion between the head portion and the lock-engaging portion and fixing the head portion to the lock-engaging portion. The joining portion includes a shape memory material, which reversibly deforms without breakage when a first turning force on the key is exceeded, where the first turning force is lower than a second turning force. The second turning force being a turning force which if exceeded causes breakage of the lock-engaging portion or the head portion. The shape memory material may exhibit a superelastic effect in which the shape is restored when the turning force ceases, or shape memory effect in which the shape is restored on heating above a state-transition temperature.

A key for operating a mechanical lock, which key includes a head portion for holding by a user, a lock-engaging portion for inserting into the lock for operating the lock by the application of a turning force, and a joining portion between the head portion and the lock-engaging portion and fixing the head portion to the lock-engaging portion. The joining portion includes a shape memory material, which reversibly deforms without breakage when a first turning force on the key is exceeded, where the first turning force is lower than a second turning force. The second turning force being a turning force which if exceeded causes breakage of the lock-engaging portion or the head portion. The shape memory material may exhibit a superelastic effect in which the shape is restored when the turning force ceases, or shape memory effect in which the shape is restored on heating above a state-transition temperature.

A key for operating a mechanical lock, which key includes a head portion for holding by a user, a lock-engaging portion for inserting into the lock for operating the lock by the application of a turning force, and a joining portion between the head portion and the lock-engaging portion and fixing the head portion to the lock-engaging portion. The joining portion includes a shape memory material, which reversibly deforms without breakage when a first turning force on the key is exceeded, where the first turning force is lower than a second turning force. The second turning force being a turning force which if exceeded causes breakage of the lock-engaging portion or the head portion. The shape memory material may exhibit a superelastic effect in which the shape is restored when the turning force ceases, or shape memory effect in which the shape is restored on heating above a state-transition temperature.

The present invention relates to a method for producing an open-cell metal molding body from zinc, tin, lead, indium, aluminum, magnesium or bismuth, or from alloys of such metals, and to the use of the obtained metal molding body as an anode.

The invention discloses a cosmetic zinc alloy massage head formula and a preparation technology thereof. The formula comprises the following raw materials: 4.19% of aluminum, 0.0027% of lead, 0.0005% of cadmium, 0.0011% of copper, 0.0073% of iron, 0.044% of magnesium, smaller than 0.0005% of tin, smaller than 0.001% of nitrogen, and zinc for the residual. A zinc alloy massage head has high impact strength and good tear resistance, and the technology can effectively improve conductivity stability and fullness, the surface strength and abrasive resistance of products; the conductivity of the alloy head is good after water electroplating; the conductivity of the alloy head is greatly improved, which is conducive to releasing charged ions on the surface of the human body, and especially in winter, the alloy head can release static electricity generated by dry air, and play a similar role as a ground wire in a current circuit.

The invention discloses a cosmetic zinc alloy massage head formula and a preparation technology thereof. The formula comprises the following raw materials: 4.19% of aluminum, 0.0027% of lead, 0.0005% of cadmium, 0.0011% of copper, 0.0073% of iron, 0.044% of magnesium, smaller than 0.0005% of tin, smaller than 0.001% of nitrogen, and zinc for the residual. A zinc alloy massage head has high impact strength and good tear resistance, and the technology can effectively improve conductivity stability and fullness, the surface strength and abrasive resistance of products; the conductivity of the alloy head is good after water electroplating; the conductivity of the alloy head is greatly improved, which is conducive to releasing charged ions on the surface of the human body, and especially in winter, the alloy head can release static electricity generated by dry air, and play a similar role as a ground wire in a current circuit.