Effect of aging process on microstructure and mechanical properties of C17200 beryllium bronze

doi:10.13251/j.issn.0254-6051.2025.05.025

Abstract

Abstract: Effects of aging temperature (280, 320, 360 ℃) and aging time (1-300 min) on the microstructure and properties of C17200 alloy were studied by means of Vickers hardness tester, electro hydraulic servo mechanics testing system, X-ray diffractometer and scanning electron microscope. The results show that the higher the aging temperature, the more rapid the precipitation rate of discontinuous precipitation at the grain boundary, and the faster the arcing growth rate into the grains. Moreover, the proportion of twin boundary in solution treated alloy is 61%, and decreases with aging temperature increasing due to the destruction of intragranular structure by discontinuous precipitates. The low angle grain boundary of 2.5%-6.1% exists in the aged alloy, which is much higher than that of 1.1% in the solution treated. The mechanical property test shows that the optimal aging process for the C17200 alloy is at 320 ℃ for 180 min, and as a result the highest tensile strength of 1206 MPa can be obtained.

Key words: C17200 beryllium bronze, aging, discontinuous precipitation, microstructure, mechanical properties

CLC Number:

TG166.2

Zou Zezhi, Chen Zhiyan, Liu Huiqun, Wu Haihong. Effect of aging process on microstructure and mechanical properties of C17200 beryllium bronze[J]. Heat Treatment of Metals, 2025, 50(5): 160-167.

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