Low expansion alloys are of great importance and can be used for the development of new aerospace materials. Herein, we report diverse rare earth quasicrystal alloys fabricated by the vacuum suction casting process. The effects of the addition of cerium (Ce) on the microstructure, thermal expansion properties, and microhardness of the Al-Cu-Fe alloy were systematically investigated. This study discovered the tiny Al-Cu-Fe-Ce microstructure. A uniform distribution could be achieved after Ce addition amount elevated. At the Ce addition amount of 1 at%, the lowest alloy thermal expansion coefficient was obtained. The alloy exhibited the maximum microhardness under these conditions. The microhardness of alloys containing 1 at% of Ce was approximately 2.4 times higher than the microhardness exhibited by alloys devoid of Ce additives. The coefficient of thermal expansion decreases by approximately 20%. The use of the suction casting process and the addition of an appropriate amount of cerium can potentially help design and develop Al-Cu-Fe-Ce alloys.

This manuscript contains four data sets, namely, the test results of XRD, DSC, coefficient of thermal expansion and microhardness. The data collection and processing methods are as follows:

1. XRD data set. Data collection methods are as follows: In the presence of Cu K αradiation (λ= 0.1542 nm), we recorded (Al₆₃Cu₂₅Fe₁₂)_100-xCe_x (x = 0, 0.1, 0.5, 1, and 2 at%) alloys for their X-ray diffraction (XRD-6000) patterns. The scanning speed and scanning angle were set at 4°/ min and 20°-90°,  The processing method is: import the TXT text file after xrd-6000 test into origin 8.6 software for drawing.
2. The DSC data set. Data collection methods are as follows: Thermal analysis was conducted using high-temperature differential scanning calorimetry (TGA / dsc1). The experiments were conducted under an atmosphere of AR, and we set the heating rate at 20° The mass of the sample used for the DSC experiments was approximately 30 mg.
3. Thermal expansion coefficient data set. Data collection methods are as follows: We prepared (Al₆₃Cu₂₅Fe₁₂)_100-xCe_x alloy into the dimension of φ 2 mm  ×  5 mm for investigating its thermal expansion characteristics. This experiment adopted the thermal and mechanical analyzer (TMA/SDTA-840). In the experimental process, we heated the specimen between 30°C and 500°C at the 5°C / min heating rate at Ar atmosphere the computer was utilized to record all data, while METTLER TOLEDO thermal analysis system was adapted for data analysis, At the same time, Microsoft Office Excel software is used to calculate the average thermal expansion coefficient in different temperature ranges, and the calculation results are imported into origin 8.6 software for drawing.
4. Microhardness data set. Data collection methods are as follows: Microhardness tests of the alloys were conducted using a Bruker hygitron Ti premier nanomechanical testing instrument operated at a temperature of 25℃. The processing method is: import the data from Bruker hysitron Ti premier nano mechanical testing instrument into origin 8.6 software for drawing.

This manuscript contains four data sets, namely, the test results of XRD, DSC, coefficient of thermal expansion and microhardness. The data collection and processing methods are as follows:

1. XRD data set. Data collection methods are as follows: In the presence of Cu K αradiation (λ= 0.1542 nm), we recorded (Al₆₃Cu₂₅Fe₁₂)_100-xCe_x (x = 0, 0.1, 0.5, 1, and 2 at%) alloys for their X-ray diffraction (XRD-6000) patterns. The scanning speed and scanning angle were set at 4°/ min and 20°-90°,  The processing method is: import the TXT text file after xrd-6000 test into origin 8.6 software for drawing.
2. The DSC data set. Data collection methods are as follows: Thermal analysis was conducted using high-temperature differential scanning calorimetry (TGA / dsc1). The experiments were conducted under an atmosphere of AR, and we set the heating rate at 20° The mass of the sample used for the DSC experiments was approximately 30 mg.
3. Thermal expansion coefficient data set. Data collection methods are as follows: We prepared (Al₆₃Cu₂₅Fe₁₂)_100-xCe_x alloy into the dimension of φ 2 mm  ×  5 mm for investigating its thermal expansion characteristics. This experiment adopted the thermal and mechanical analyzer (TMA/SDTA-840). In the experimental process, we heated the specimen between 30°C and 500°C at the 5°C / min heating rate at Ar atmosphere the computer was utilized to record all data, while METTLER TOLEDO thermal analysis system was adapted for data analysis, At the same time, Microsoft Office Excel software is used to calculate the average thermal expansion coefficient in different temperature ranges, and the calculation results are imported into origin 8.6 software for drawing.
4. Microhardness data set. Data collection methods are as follows: Microhardness tests of the alloys were conducted using a Bruker hygitron Ti premier nanomechanical testing instrument operated at a temperature of 25℃. The processing method is: import the data from Bruker hysitron Ti premier nano mechanical testing instrument into origin 8.6 software for drawing.