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往復(fù)擠壓對Mg-6%Si合金組織與力學(xué)性能的影響
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國家自然科學(xué)基金(50671083)及陜西省自然科學(xué)基金(2007E101)


Effects of Reciprocating Extrusion on Microstructures and Mechanical Properties of Mg-6%Si Alloy
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    摘要:

    研究了往復(fù)擠壓對鑄造Mg-6%Si (質(zhì)量分?jǐn)?shù),下同)合金微觀組織和力學(xué)性能的影響。結(jié)果表明：往復(fù)擠壓4道次后，Mg-6%Si合金的顯微組織得到顯著細(xì)化，粗大樹枝狀的初生Mg2Si相變?yōu)榧?xì)小顆粒狀，而漢字狀的共晶Mg2Si相也變?yōu)閺浬⒎植嫉狞c狀相，且這些顆粒狀的Mg2Si相均勻分布在基體中。往復(fù)擠壓4道次后，Mg-6%Si合金的抗拉強(qiáng)度和延伸率分別提高了82.3%和810.9%。斷口分析表明，往復(fù)擠壓合金的斷裂模式由脆性斷裂轉(zhuǎn)變?yōu)轫g-脆性斷裂。

    Abstract:

    Effects of reciprocating extrusion on the microstructure and mechanical properties of the as-cast Mg-6%Si alloy were studied. Results show that the microstructures of the Mg-6%Si alloy are refined markedly after reciprocating extrusion with 4 passes; the coarse dendritic primary Mg2Si phase changes into fine granules, the size of the Chinese-character-like eutectic Mg2Si phase also decreases gradually and more uniform distribution of the granular Mg2Si phase in the matrix is obtained. After reciprocating extrusion with 4 passes, the tensile strength and the elongation are increased by 82.3% and 810.9%, respectively, compared with those of the as-cast alloy. Fracture analysis shows that the fracture mode of the alloy changes from brittle fracture to ductile-brittle fracture after reciprocating extrusion

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賴云亭,王錦程,司 林,李安濤,楊根倉.往復(fù)擠壓對Mg-6%Si合金組織與力學(xué)性能的影響[J].稀有金屬材料與工程,2011,40(3):519~522.[Lai Yunting, Wang Jincheng, Si Lin, Li Antao, Yang Gencang. Effects of Reciprocating Extrusion on Microstructures and Mechanical Properties of Mg-6%Si Alloy[J]. Rare Metal Materials and Engineering,2011,40(3):519~522.]
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  • 收稿日期:2010-03-25
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