Effect of aging treatment on mechanical properties and microstructure of low pressure cast ZL114A alloy

doi:10.13251/j.issn.0254-6051.2024.01.028

Abstract

Abstract: Taking low-pressure cast ZL114A alloy as the research object, the microstructure and mechanical properties of the solution and aging treated alloy specimens were observed and tested by means of optical microscope, Brinell hardness tester and universal testing machine. At the beginning of aging treatment, the strength of the alloy increases rapidly, and the growth trend slows down with the aging time extension. After aging at 155 ℃ for 12 h, the tensile strength and yield strength of the alloy increases from 266.7 MPa and 161.7 MPa in solid solution state to 333.3 MPa and 272.3 MPa, respectively. The elongation of the alloy decreases with aging time increasing, from 12.00% in solid solution state to 7.00% after aging at 155 ℃ for 12 h. The higher the aging temperature, the greater the atomic diffusion driving force, the faster the strength of the alloy increases, the shorter the time is required to reach the peak, and the faster the elongation decreases. The reason for the increase of strength and decrease of elongation of the alloy is the segregation of Mg and Si atoms and the formation of stable Mg₂Si phase. With the precipitation and transformation of the second phase, the degree of coherency between the second phase and the matrix gradually decreases, and the strength of the alloy reaches the maximum when the second phase maintains a semi-coherent relationship with the matrix.

Key words: ZL114A alloy, aging treatment, low pressure casting, mechanical properties, microstructure

CLC Number:

TG166.3

Tian Shaokun, Jin Yuanping, Wang Ping, Yang Kun, Liu Xiaofei, Guo Zhan, Yu Ruixing, Fan Qingli. Effect of aging treatment on mechanical properties and microstructure of low pressure cast ZL114A alloy[J]. Heat Treatment of Metals, 2024, 49(1): 179-185.

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