成都耍快餐2020

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鋁外殼加工過程中冷變形對鋁材的影響?

時間:2018-09-03瀏覽次數:987 作者:頂泰鋁業

一、鋁型材擠壓經冷變形后,由于發生了晶內及晶間的破壞,晶格產生了畸變以及出現了第二類殘余應力等,使塑性指標急劇下降,在極限狀態下可能接近于完全脆性的狀態;另一方面,由于晶格畸變、位錯增多、晶粒被拉長細化以及出現亞結構等,而使其強度指標大為提高,即出現加工硬化現象。



二、鋁型材經較大冷變形后,由于出現織構而使材料呈現各向異性。例如,鋁合金薄板在深沖時易出現明顯的制耳。應合理控制加工條件以充分利用織構與各向異性的有利方面,而避免或消除其不利的方面。


三、

1、密度。冷變形后,因晶內及晶間出現了顯微裂紋或宏觀裂紋、裂口空洞等缺陷,使鋁材密度減小。


2、電阻。晶間物質的破壞使晶粒直接接觸、晶粒位向有序化、晶間及晶內破裂等,都對電阻的變化有明顯的影響。前兩者使電阻隨變形程度的增加而減少,后者則相反。


3、化學穩定性。經冷變形后,材料內能增高,使其化學性能更不穩定而易被腐蝕,特別是易于產生應力腐蝕。

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成都耍快餐2020
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