鋁單板熱處理(li)強(qiang)化的(de)(de)第二(er)階段是時(shi)(shi)(shi)效，時(shi)(shi)(shi)效方法有(you)人(ren)(ren)工(gong)(gong)時(shi)(shi)(shi)效與自(zi)(zi)(zi)然(ran)(ran)(ran)時(shi)(shi)(shi)效。人(ren)(ren)工(gong)(gong)時(shi)(shi)(shi)效是控(kong)制在一(yi)定(ding)溫(wen)(wen)度(du)下(xia)進行的(de)(de)時(shi)(shi)(shi)效；自(zi)(zi)(zi)然(ran)(ran)(ran)時(shi)(shi)(shi)效是在室溫(wen)(wen)下(xia)放(fang)置(zhi)，無其他處理(li)的(de)(de)工(gong)(gong)序。一(yi)般硬(ying)鋁(lv)合金自(zi)(zi)(zi)然(ran)(ran)(ran)時(shi)(shi)(shi)效比人(ren)(ren)工(gong)(gong)時(shi)(shi)(shi)效的(de)(de)強(qiang)度(du)稍低，但耐蝕(shi)性能好，在常溫(wen)(wen)下(xia)使 用(yong)的(de)(de)材(cai)料(liao)(liao)可采用(yong)自(zi)(zi)(zi)然(ran)(ran)(ran)時(shi)(shi)(shi)效。但高溫(wen)(wen)下(xia)使用(yong)時(shi)(shi)(shi)，自(zi)(zi)(zi)然(ran)(ran)(ran)時(shi)(shi)(shi)效的(de)(de)材(cai)料(liao)(liao)不(bu)穩定(ding)，則必(bi)須采用(yong)人(ren)(ren)工(gong)(gong)時(shi)(shi)(shi)效。超硬(ying)鋁(lv)（7A04）自(zi)(zi)(zi)然(ran)(ran)(ran)時(shi)(shi)(shi)效 時(shi)(shi)(shi)間太長，而且耐蝕(shi)性比人(ren)(ren)工(gong)(gong)時(shi)(shi)(shi)效的(de)(de)差，因此采用(yong)人(ren)(ren)工(gong)(gong)時(shi)(shi)(shi)效是合理(li)的(de)(de)。