<p>Herein, we report on a study of precipitates control and related strengthening mechanism of Cu-1.95wt%Be alloy aged at 320 °C. The phase transformation sequence of the alloy aged at 320 °C is GP zones <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10853_2025_11734_Article_IEq1.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$\to$</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation> γ′′ phases <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10853_2025_11734_Article_IEq1.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$\to$</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation> strip-like γ′ phases formed through a continuous precipitation process <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10853_2025_11734_Article_IEq1.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$\to$</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation> strip-like γ′ phases, long plate-shaped γ′ phases and spherical γ phase formed through a discontinuous precipitation process. The long plate-shaped γ′ phases and spherical γ phase mainly nucleate at the grain boundaries through discontinuous precipitation and then grow into the interior of the grains with the increase in aging time. The complex interactions that occur among the dislocations and precipitates lead to differences in mechanical properties and related strengthening mechanism for different microstructures. Our research results provide fundamental insight into the precipitation behaviors and related strengthening mechanisms of the Cu-Be alloys.</p>

The mechanisms for evolution and strengthening of precipitates in the Ni-added Cu-1.95wt%Be alloy with high strengths

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发表日期：

2025年10月29日

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Kuo Yang,
Yihan Wang,
Mingxing Guo,
Yongda Mo,
Miaomiao Wang,
Dongxin Wang,
Fang Liu,
Yunpeng Wang,
Tongbo Wang,
Wei Zhou,
Guojie Huang,
Huafen Lou

摘要

Herein, we report on a study of precipitates control and related strengthening mechanism of Cu-1.95wt%Be alloy aged at 320 °C. The phase transformation sequence of the alloy aged at 320 °C is GP zones $\to$ $\to$ γ′′ phases $\to$ $\to$ strip-like γ′ phases formed through a continuous precipitation process $\to$ $\to$ strip-like γ′ phases, long plate-shaped γ′ phases and spherical γ phase formed through a discontinuous precipitation process. The long plate-shaped γ′ phases and spherical γ phase mainly nucleate at the grain boundaries through discontinuous precipitation and then grow into the interior of the grains with the increase in aging time. The complex interactions that occur among the dislocations and precipitates lead to differences in mechanical properties and related strengthening mechanism for different microstructures. Our research results provide fundamental insight into the precipitation behaviors and related strengthening mechanisms of the Cu-Be alloys.