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The formation and the thermal stability of a connected hard skeleton structure(CHSS) in the matrix of Mg-5Al-2Sn-5Ca(ATX525) alloy were investigated by using X-ray diffractometer, scanning electron microscopy, differential scanning calorimeter, creep tester and isothermal treatment method. The results indicated that the CHSS composed of Mg2(Al,Ca) and Al2 Ca intermetallics was formed into a typical eutectic structure and no obvious change occurred when the samples were isothermally treated at 250 °C for 96 h and 350 °C for 72 h, respectively. It became a chained structure when isothermally treated at 450 °C for 48 h. The dissolution and reconstruction processes, however, were observed for the CHSS when the processing temperature was up to 550 °C. The creep life at the stress-temperature condition of 50MPa/200°C for the alloy treated at 450 °C for 48 h was as high as 510 h, and the strain at creep time of 100 h was as low as 0.03%, which indicated that the present alloy has not only a good thermal stability, but also a better heat resistance.
The formation and the thermal stability of a connected hard skeleton structure (CHSS) in the matrix of Mg-5Al-2Sn-5Ca (ATX525) alloy were investigated by using X- ray diffractometer, scanning electron microscopy, differential scanning calorimeter, creep tester and isothermal treatment method. The results indicated that the CHSS composed of Mg2 (Al, Ca) and Al2 Ca intermetallics was formed into a typical eutectic structure and no obvious change occurred occurred when the samples were isothermally treated at 250 ° C for 96 h and 350 ° C for 72 h, respectively. It became a chained structure when isothermally treated at 450 ° C for 48 h. The dissolution and reconstruction processes, however, were observed for the CHSS when the processing temperature was up to 550 ° C. The creep life at the stress-temperature condition of 50 MPa / 200 ° C for the alloy treated at 450 ° C for 48 h was as high as 510 h, and the strain at creep time of 100 h was as low as 0.03%, which indicated that the present alloy has not on ly a good thermal stability, but also a better heat resistance.