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Creep of Rheocast 7075 Aluminum Alloy at 300 °C

Creep of rheocast 7075-T6 aluminum alloy produced by the Gas Induced Semi-Solid (GISS) process was investigated at temperature of 300 °C and stress range of 20-70 MPa and compared to that of wrought 7075-T651 aluminum alloy. The rheocast 7075-T6 alloy exhibited lower minimum creep rate and longer rupture time than the wrought 7075-T651 alloy. The total rupture strain of the rheocast alloy was shorter than that of the wrought one. According to the power law creep, the stress exponents, n of the rheocast 7075-T6 and the wrought 7075-T651 alloys were 5.9 and 7.9 respectively. Based on the determined n values, the creep deformation of both alloys was possibly controlled by the dislocation glide and climb-controlled mechanism.

Trans Tech Publications, Ltd.

Saravut Thongkam Sirikul Wisutmethangoon Jessada Wannasin Suchart Chantaramanee Thawatchai Plookphol

Applied Mechanics and Materials

2013

Title: Creep of Rheocast 7075 Aluminum Alloy at 300 °C

Description:

The rheocast 7075-T6 alloy exhibited lower minimum creep rate and longer rupture time than the wrought 7075-T651 alloy.

The total rupture strain of the rheocast alloy was shorter than that of the wrought one.

According to the power law creep, the stress exponents, n of the rheocast 7075-T6 and the wrought 7075-T651 alloys were 5.

9 and 7.

9 respectively.

Based on the determined n values, the creep deformation of both alloys was possibly controlled by the dislocation glide and climb-controlled mechanism.

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