Heating and cooling cycle test of metal matrix composites

Dimensional stability is a basic property of materials that exists all the time. The dimensional stability of high-precision instrumentation materials refers to the fact that the material or part maintains its original size and shape under long-term storage environment (constant temperature, variable temperature) or service environment (variable temperature, impact, vibration). The ability to maintain shape is characterized by the change in size or shape measured in a fixed environment after the part is stored or in service (after being exposed to a fixed environment or a non-constant environment). Specifically, it can be characterized by the change in the length of the sample with the number of cycles during the temperature cycle.
The thermal cycle test of metal matrix composite materials can determine the dimensional stability of aluminum-based composite materials (hot and cold cycle temperature range: 20 ℃ ~ 150 ℃), magnesium-based composite materials (hot and cold cycle temperature range: 20 ℃ ~ 150 ℃), and iron-based composite materials (hot and cold cycle temperature range: 20 ℃ ~ 490 ℃).
Zhongke Testing Reliability Experiment Center has the capability of reliability performance testing of various metals and alloys, and provides professional hot and cold cycle testing services for metal matrix composite materials.

Metal matrix composite materials are composite materials with metal (such as aluminum, magnesium, titanium, nickel, etc.) or alloy as the matrix and particles, fibers, whiskers, etc. as reinforcements.
It can be divided into aluminum-based, magnesium-based, copper-based, titanium-based, high-temperature alloy-based, intermetallic compound-based and refractory metal-based composite materials.

1. Use a single pushrod or double pushrod thermal dilatometer, with the help of quartz differential components of the same stable material, to measure the length change of the metal matrix composite material at 20°C before the first cycle and after each hot and cold cycle (a total of 15 hot and cold cycles).
2. The push rod transmits the change in specimen length to the sensor. The shape and size of the push rod should ensure that the load is applied to the specimen.

GB/T 41739-2022 Dimensional stability detection method of metal matrix composite materials Hot and cold cycle method
GB/T 4339 Determination of thermal expansion characteristic parameters of metallic materials
JC/T2250 fused quartz