熱處理溫度對Zr44Co56合金顯微組織和力學(xué)性能影響

熱處理溫度對Zr44Co56合金顯微組織和力學(xué)性能影響Effect of heat treatment temperature on microstructure and mechanical properties of Zr44Co56 alloy

利用X射線衍射儀(XRD)、金相顯微鏡、萬能試驗機和掃描電鏡(SEM)等儀器研究在不同熱處理溫度下Zr44Co56合金顯微組織和力學(xué)性能。結(jié)果表明：在不同熱處理溫度下，試樣顯微組織由基體B2相和第二相B33相所組成；在熱處理溫度723、773和823 K下，B33相相對含量相對于鑄態(tài)合金呈增加趨勢；當(dāng)熱處理溫度達到873 K時，少量的B33相在晶界處析出；隨熱處理溫度增高，顆粒形狀由鑄態(tài)的小塊狀變?yōu)榇志€條狀，再到細條狀。試樣在723 K下熱處理后，其屈服強度和線彈性極限值均大于鑄態(tài)合金的相應(yīng)值，而試樣在773、823和873 K下熱處理后，其屈服強度和線彈性極限值均小于鑄態(tài)合金的相應(yīng)值。試樣在873 K下熱處理后，當(dāng)壓縮應(yīng)變達到18%時，其外表面無任何宏觀裂縫，材料呈現(xiàn)加工硬化現(xiàn)象；而在其余溫度下熱處理后，材料斷裂機制為延性斷裂與解理斷裂相混合的斷裂機制。

The microstructure and mechanical properties of Zr44Co56 alloy were studied by X-ray diffraction (XRD), metallographic microscopy, universal testing machine and scanning electron microscopy (SEM). The results show that the microstructures of the specimens at different heat-treatment temperatures are composed of B2 matrix phase and the second phase B33 phase. At heat-treatment temperatures of 723, 773 and 823 K, the relative content of the B33 phases exhibits an increasing trend comparing with the as-cast alloy. At 873 K, a small amount of the B33 phases precipitate at the grain boundaries; the particle shapes transform from the small bulk of as-casting state to thick line strip, and then to thin strips with increasing the heat-treatment temperature. The yield strength and elastic limit values of samples at the heat-treatment temperature of 723 K are greater than those of the as-cast alloy; however, the yield strength and elastic limit values of samples at heat-treatment temperatures of 773, 823 and 873 K are less than those of the as-cast alloy. When the compressive strain reaches 18%, the outer surface of the sample at the heat-treatment temperature of 873 K has no macroscopic cracks, and the material exhibits the work-hardening phenomenon; and the fracture mechanism of samples is the combining fracture mechanism of ductile fracture and cleavage fracture at other heat-treatment temperatures.

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